cpu/intel: Rename socket_mFCPGA478 to socket_m

The name was wrong. mFCPGA478 is actually a pseudonym for mPGA478MN,
the successor of the socket that was meant.

The official name of this socket is mPGA478MT. But "Socket M" is much
easier to distinguish.

Change-Id: I4efeaca69acddfcdc5e957b0b521544314d46eeb
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/31642
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

util/docker/coreboot.org-status/board-status.html/tohtml.sh

@@ -323,9 +323,9 @@ EOF
 			INTEL_SOCKET_MPGA604)
 				cpu_nice="Intel® Xeon®";
 				socket_nice="Socket 604";;
-			INTEL_SOCKET_MFCPGA478)
+			INTEL_SOCKET_M)
 				cpu_nice="Intel® Core™ 2 Duo Mobile, Core™ Duo/Solo, Celeron® M";
-				socket_nice="Socket mPGA478";;
+				socket_nice="Socket M (mPGA478MT)";;
 			INTEL_SOCKET_LGA771)
 				cpu_nice="Intel Xeon™ 5000 series";
 				socket_nice="Socket LGA771";;