Makefile.inc: relocate get_fmap_value() here from soc/intel/common/block/cse

Move this function to the root Makefile.inc since other Makefiles use
the exact same function call. Will allow for deduplication in AMD SoC
Makefiles in a follow-on commit.

Change-Id: I56a50e21b27a4cd6ce1a08a3aea338c63322a6b2
Signed-off-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76167
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Makefile.inc b/Makefile.inc
index ab57abd..9a34c61 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -146,6 +146,7 @@
 # tolower:        returns the value in all lowercase
 # toupper:        returns the value in all uppercase
 # ws_to_under:    returns the value with any whitespace changed to underscores
+# get_fmap_value  returns the value of a given FMAP field from fmap_config.h
 _toint=$(shell printf "%d" $1)
 _tohex=$(shell printf 0x"%x" $1)
 _int-add2=$(shell expr $(call _toint,$1) + $(call _toint,$2))
@@ -165,6 +166,7 @@
 tolower=$(shell echo '$1' | tr '[:upper:]' '[:lower:]')
 toupper=$(shell echo '$1' | tr '[:lower:]' '[:upper:]')
 ws_to_under=$(shell echo '$1' | tr ' \t' '_')
+get_fmap_value=$(shell awk '$$2 == "$1" {print $$3}' $(obj)/fmap_config.h)
 
 #######################################################################
 # Helper functions for ramstage postprocess