x86, mce: Enable MCA support by default

MCA is the basic support for hardware error logging and reporting, and
it is majorly unwise to run without it so enable machine check software
support by default on x86.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Acked-by: Tony Luck <tony.luck@intel.com>

arch/x86/Kconfig

@@ -871,6 +871,7 @@ config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
 
 config X86_MCE
 	bool "Machine Check / overheating reporting"
+	default y
 	---help---
 	  Machine Check support allows the processor to notify the
 	  kernel if it detects a problem (e.g. overheating, data corruption).