build system: Remove flock calls from intermediate processing

Now that intermediate coreboot.pre manipulation is serialized within
the build system, remove the flock calls.

Change-Id: I8a767918aec5fcb7127ebb19ac46e58bed7967fb
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49381
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/ec/hp/kbc1126/Makefile.inc

@@ -21,7 +21,7 @@ ifeq ($(CONFIG_KBC1126_FIRMWARE),y)
 	printf "    Building kbc1126_ec_insert.\n"
 	$(MAKE) -C util/kbc1126
 	printf "    KBC1126    Inserting KBC1126 firmware blobs.\n"
-	flock $< $(KBC1126_EC_INSERT) $(obj)/coreboot.pre \
+	$(KBC1126_EC_INSERT) $(obj)/coreboot.pre \
 		$(CONFIG_KBC1126_FW1_OFFSET) $(CONFIG_KBC1126_FW2_OFFSET)
 endif