efi/libstub: Re-enable command line initrd loading for x86

Commit:

  cf6b8366 ("efi/libstub: Make initrd file loader configurable")

inadvertently disabled support on x86 for loading an initrd passed via
the initrd= option on the kernel command line.

Add X86 to the newly introduced Kconfig option's title and depends
declarations, so it gets enabled by default, as before.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-efi@vger.kernel.org

drivers/firmware/efi/Kconfig

@@ -125,8 +125,8 @@ config EFI_ARMSTUB_DTB_LOADER
 	  this option is necessary.
 
 config EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER
-	bool "Enable the command line initrd loader"
-	depends on EFI_GENERIC_STUB
+	bool "Enable the command line initrd loader" if !X86
+	depends on EFI_STUB && (EFI_GENERIC_STUB || X86)
 	default y
 	help
 	  Select this config option to add support for the initrd= command