Kconfig: regularize selection of CONFIG_BINFMT_ELF

with mips converted to use of fs/config_binfmt_elf.c, there's no
need to keep selects of that thing all over arch/* - we can simply
turn into def_bool y if COMPAT && BINFMT_ELF (in fs/Kconfig.binfmt)
and get rid of all selects.

Several architectures got those selects wrong (e.g. you could
end up with sparc64 sans BINFMT_ELF, with select violating
dependencies, etc.)

Randy Dunlap has spotted some of those; IMO this is simpler than
his fix, but it depends upon the stuff that would need to be
backported, so we might end up using his variant for -stable.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/arm64/Kconfig

@@ -1215,7 +1215,6 @@ config ARM64_TAGGED_ADDR_ABI
 menuconfig COMPAT
 	bool "Kernel support for 32-bit EL0"
 	depends on ARM64_4K_PAGES || EXPERT
-	select COMPAT_BINFMT_ELF if BINFMT_ELF
 	select HAVE_UID16
 	select OLD_SIGSUSPEND3
 	select COMPAT_OLD_SIGACTION

arch/mips/Kconfig

@@ -3278,7 +3278,6 @@ config MIPS32_O32
 	select ARCH_WANT_OLD_COMPAT_IPC
 	select COMPAT
 	select MIPS32_COMPAT
-	select COMPAT_BINFMT_ELF
 	select SYSVIPC_COMPAT if SYSVIPC
 	help
 	  Select this option if you want to run o32 binaries.  These are pure
@@ -3292,7 +3291,6 @@ config MIPS32_N32
 	depends on 64BIT
 	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
 	select COMPAT
-	select COMPAT_BINFMT_ELF
 	select MIPS32_COMPAT
 	select SYSVIPC_COMPAT if SYSVIPC
 	help

arch/parisc/Kconfig

@@ -336,7 +336,6 @@ source "kernel/Kconfig.hz"
 config COMPAT
 	def_bool y
 	depends on 64BIT
-	select COMPAT_BINFMT_ELF if BINFMT_ELF
 
 config SYSVIPC_COMPAT
 	def_bool y

arch/powerpc/Kconfig

@@ -282,7 +282,6 @@ config COMPAT
 	bool "Enable support for 32bit binaries"
 	depends on PPC64
 	default y if !CPU_LITTLE_ENDIAN
-	select COMPAT_BINFMT_ELF
 	select ARCH_WANT_OLD_COMPAT_IPC
 	select COMPAT_OLD_SIGACTION
 

arch/s390/Kconfig

@@ -423,7 +423,6 @@ config 64BIT
 config COMPAT
 	def_bool y
 	prompt "Kernel support for 31 bit emulation"
-	select COMPAT_BINFMT_ELF if BINFMT_ELF
 	select ARCH_WANT_OLD_COMPAT_IPC
 	select COMPAT_OLD_SIGACTION
 	select HAVE_UID16

arch/sparc/Kconfig

@@ -494,7 +494,6 @@ config COMPAT
 	bool
 	depends on SPARC64
 	default y
-	select COMPAT_BINFMT_ELF
 	select HAVE_UID16
 	select ARCH_WANT_OLD_COMPAT_IPC
 	select COMPAT_OLD_SIGACTION

arch/x86/Kconfig

@@ -2899,7 +2899,6 @@ config COMPAT_32
 config COMPAT
 	def_bool y
 	depends on IA32_EMULATION || X86_X32
-	select COMPAT_BINFMT_ELF if BINFMT_ELF
 
 if COMPAT
 config COMPAT_FOR_U64_ALIGNMENT

fs/Kconfig.binfmt

@@ -29,7 +29,7 @@ config BINFMT_ELF
 	  latest version).
 
 config COMPAT_BINFMT_ELF
-	bool
+	def_bool y
 	depends on COMPAT && BINFMT_ELF
 	select ELFCORE