feat(rme): add GPT Library

This patch introduces the Granule Protection Table (GPT)
library code. This implementation will be updated later to
be more flexible, as the current implementation is very rigid.

Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: I3af824a28c6e9a5d36459c0c51d2d9bebfba1505
diff --git a/bl2/bl2.mk b/bl2/bl2.mk
index 54c73f5..fd83747 100644
--- a/bl2/bl2.mk
+++ b/bl2/bl2.mk
@@ -17,10 +17,12 @@
 
 ifeq (${ENABLE_RME},1)
 # Using RME, run BL2 at EL3
+include lib/gpt/gpt.mk
+
 BL2_SOURCES		+=      bl2/${ARCH}/bl2_rme_entrypoint.S	\
 				bl2/${ARCH}/bl2_el3_exceptions.S	\
 				bl2/${ARCH}/bl2_run_next_image.S	\
-
+				${GPT_LIB_SRCS}
 BL2_LINKERFILE		:=	bl2/bl2.ld.S
 
 else ifeq (${BL2_AT_EL3},0)