[IA64] MCA: remove obsolete ifdef
[IA64] MCA: remove obsolete ifdef

No platform in the community tree uses PLATFORM_MCA_HANDLERS, remove
the references.

Signed-off-by: Keith Owens <ac0deeb8a1ce0892219186da4896ac373af5313a@sgi.com>
Signed-off-by: Tony Luck <e7984595ec0368ff920a7b3521dc7093683f6f26@intel.com>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs