driver: fmc: Makefile: Correct the default value of 'REPO_PARENT'

Signed-off-by: Vaibhav Gupta <vaibhav.gupta@cern.ch>

drivers/fmc/Makefile

@@ -5,7 +5,7 @@
 -include Makefile.specific
 # include parent_common.mk for buildsystem's defines
 #use absolute path for REPO_PARENT
-REPO_PARENT ?= $(shell /bin/pwd)/../..
+REPO_PARENT ?= $(shell /bin/pwd)/../../..
 -include $(REPO_PARENT)/parent_common.mk
 
 KERNELSRC ?= /lib/modules/$(shell uname -r)/build