cpu/intel: Rename socket_mPGA478MN to socket_p

These marketing names are much easier to distinguish. My
mnemonic: Socket M => up to Merom, Socket P => up to Penryn.

Change-Id: I3c2a59596cf7f3cd763bd79962ad326ab080677b
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/31645
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/cpu/intel/Makefile.inc b/src/cpu/intel/Makefile.inc
index e4d3f84..9535262 100644
--- a/src/cpu/intel/Makefile.inc
+++ b/src/cpu/intel/Makefile.inc
@@ -9,7 +9,7 @@
 subdirs-$(CONFIG_CPU_INTEL_SOCKET_BGA1284) += socket_BGA1284
 subdirs-$(CONFIG_CPU_INTEL_SOCKET_FCBGA559) += socket_FCBGA559
 subdirs-$(CONFIG_CPU_INTEL_SOCKET_M) += socket_m
-subdirs-$(CONFIG_CPU_INTEL_SOCKET_MPGA478MN) += socket_mPGA478MN
+subdirs-$(CONFIG_CPU_INTEL_SOCKET_P) += socket_p
 subdirs-$(CONFIG_CPU_INTEL_SOCKET_MPGA604) += socket_mPGA604
 subdirs-$(CONFIG_NORTHBRIDGE_INTEL_NEHALEM) += model_2065x
 subdirs-$(CONFIG_NORTHBRIDGE_INTEL_SANDYBRIDGE) += model_206ax