x86/mce: Make usable address checks Intel-only

x86/mce: Make usable address checks Intel-only

The MCi_MISC bitfield definitions mce_usable_address() checks
are Intel-only. Make them so.

While at it, move mce_usable_address() up, before all its
callers and get rid of the forward declaration.

Signed-off-by: Borislav Petkov <[email protected]>
Acked-by: Tony Luck <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>