Documentation: Build mic/mpssd only for x86_64

mic/mpssd along with MIC drivers are currently only usable on
x86_64. So build mic/mpssd only for x86_64 to avoid build breaks on
big-endian systems.
Reported-by: NDaniel Borkmann <dborkman@redhat.com>
Reported-by: NDan Streetman <ddstreet@gmail.com>
Suggested-by: NPeter Foley <pefoley2@pefoley.com>
Signed-off-by: NAshutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/mic/mpssd/Makefile

 # List of programs to build
-hostprogs-y := mpssd
+hostprogs-$(CONFIG_X86_64) := mpssd
 
 mpssd-objs := mpssd.o sysfs.o