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/mainboard/lenovo/t400/devicetree.cb b/src/mainboard/lenovo/t400/devicetree.cb
index 4e88e27..8e90431 100644
--- a/src/mainboard/lenovo/t400/devicetree.cb
+++ b/src/mainboard/lenovo/t400/devicetree.cb
@@ -6,7 +6,7 @@
 	register "gfx.use_spread_spectrum_clock" = "1"
 
 	device cpu_cluster 0 on
-		chip cpu/intel/socket_mPGA478MN
+		chip cpu/intel/socket_p
 			device lapic 0 on end
 		end
 		chip cpu/intel/model_1067x