feat(drtm): add Event Log driver support for DRTM

Added Event Log driver support for DRTM. This driver
is responsible for the doing the hash measurement of
various DRTM components as per [1], and putting these
measurements in the Event Log buffer.

[1]: https://developer.arm.com/documentation/den0113/a, section 3.16

Change-Id: I9892c313cf6640b82e261738116fe00f7975ee12
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/bl31/bl31.mk b/bl31/bl31.mk
index f435815..9f7d96e 100644
--- a/bl31/bl31.mk
+++ b/bl31/bl31.mk
@@ -151,6 +151,7 @@
 BL31_SOURCES		+=	services/std_svc/drtm/drtm_main.c		\
 				services/std_svc/drtm/drtm_dma_prot.c		\
 				services/std_svc/drtm/drtm_res_address_map.c	\
+				services/std_svc/drtm/drtm_measurements.c	\
 				${MBEDTLS_SOURCES}
 endif