x86/mce: Remove check for CONFIG_X86_MCE_P4THERMAL

The Kconfig symbol X86_MCE_P4THERMAL was removed in v2.6.32.
Remove a useless check for its macro, as it will now always
evaluate to false.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Link: http://lkml.kernel.org/r/1369853850.23034.28.camel@x61.thuisdomein


Signed-off-by: Ingo Molnar <mingo@kernel.org>