x86/kconfig: Remove redundant 'default n' lines from all x86 Kconfig's

'default n' is the default value for any bool or tristate Kconfig
setting so there is no need to write it explicitly.

Also, since commit:

  f467c564 ("kconfig: only write '# CONFIG_FOO is not set' for visible symbols")

... the Kconfig behavior is the same regardless of 'default n' being present or not:

    ...
    One side effect of (and the main motivation for) this change is making
    the following two definitions behave exactly the same:

        config FOO
                bool

        config FOO
                bool
                default n

    With this change, neither of these will generate a
    '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied).
    That might make it clearer to people that a bare 'default n' is
    redundant.
    ...
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Juergen Gross <jgross@suse.co>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20181016134217eucas1p2102984488b89178a865162553369025b%7EeGpI5NlJo0851008510eucas1p2D@eucas1p2.samsung.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/Kconfig

@@ -447,7 +447,6 @@ config RETPOLINE
 
 config INTEL_RDT
 	bool "Intel Resource Director Technology support"
-	default n
 	depends on X86 && CPU_SUP_INTEL
 	select KERNFS
 	help
@@ -701,7 +700,6 @@ config STA2X11
 	select SWIOTLB
 	select MFD_STA2X11
 	select GPIOLIB
-	default n
 	---help---
 	  This adds support for boards based on the STA2X11 IO-Hub,
 	  a.k.a. "ConneXt". The chip is used in place of the standard
@@ -799,7 +797,6 @@ config KVM_GUEST
 config KVM_DEBUG_FS
 	bool "Enable debug information for KVM Guests in debugfs"
 	depends on KVM_GUEST && DEBUG_FS
-	default n
 	---help---
 	  This option enables collection of various statistics for KVM guest.
 	  Statistics are displayed in debugfs filesystem. Enabling this option
@@ -808,7 +805,6 @@ config KVM_DEBUG_FS
 config PARAVIRT_TIME_ACCOUNTING
 	bool "Paravirtual steal time accounting"
 	depends on PARAVIRT
-	default n
 	---help---
 	  Select this option to enable fine granularity task steal time
 	  accounting. Time spent executing other tasks in parallel with
@@ -1168,7 +1164,6 @@ source "arch/x86/events/Kconfig"
 
 config X86_LEGACY_VM86
 	bool "Legacy VM86 support"
-	default n
 	depends on X86_32
 	---help---
 	  This option allows user programs to put the CPU into V8086
@@ -2220,7 +2215,6 @@ config HOTPLUG_CPU
 
 config BOOTPARAM_HOTPLUG_CPU0
 	bool "Set default setting of cpu0_hotpluggable"
-	default n
 	depends on HOTPLUG_CPU
 	---help---
 	  Set whether default state of cpu0_hotpluggable is on or off.
@@ -2825,7 +2819,6 @@ source "drivers/pcmcia/Kconfig"
 config RAPIDIO
 	tristate "RapidIO support"
 	depends on PCI
-	default n
 	help
 	  If enabled this option will include drivers and the core
 	  infrastructure code to support RapidIO interconnect devices.

arch/x86/Kconfig.debug

@@ -314,7 +314,6 @@ config DEBUG_NMI_SELFTEST
 
 config DEBUG_IMR_SELFTEST
 	bool "Isolated Memory Region self test"
-	default n
 	depends on INTEL_IMR
 	---help---
 	  This option enables automated sanity testing of the IMR code.

arch/x86/xen/Kconfig

@@ -68,7 +68,6 @@ config XEN_SAVE_RESTORE
 config XEN_DEBUG_FS
 	bool "Enable Xen debug and tuning parameters in debugfs"
 	depends on XEN && DEBUG_FS
-	default n
 	help
 	  Enable statistics output and various tuning options in debugfs.
 	  Enabling this option may incur a significant performance overhead.