feat(tc): add dummy TRNG support to be able to boot pVMs

pVMs on Android 14 has a platform requirement to support
SMCCC TRNG discovery. This implementation add a
dummy TRNG support to TC2.

Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Change-Id: Iae0ca546cadf48a6a404ae578c7ccf5a84d057c4
diff --git a/plat/arm/board/tc/platform.mk b/plat/arm/board/tc/platform.mk
index cc3d0c7..2f23d80 100644
--- a/plat/arm/board/tc/platform.mk
+++ b/plat/arm/board/tc/platform.mk
@@ -222,6 +222,10 @@
     endif
 endif
 
+ifeq (${TRNG_SUPPORT},1)
+	BL31_SOURCES	+=	plat/arm/board/tc/tc_trng.c
+endif
+
 ifneq (${PLATFORM_TEST},)
     # Add this include as first, before arm_common.mk. This is necessary
     # because arm_common.mk builds Mbed TLS, and platform_test.mk can