refactor(qemu): handle pointer authentication

Pointer authentication requires CTX_INCLUDE_PAUTH_REGS to be defined.

Change-Id: I4ca95d6d9e619e7a7296a2c3ecb799683bf70575
Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
diff --git a/plat/qemu/common/common.mk b/plat/qemu/common/common.mk
index fca512b..b8b57d2 100644
--- a/plat/qemu/common/common.mk
+++ b/plat/qemu/common/common.mk
@@ -102,4 +102,11 @@
 ifeq (${CTX_INCLUDE_AARCH32_REGS}, 1)
 $(error "This is an AArch64-only port; CTX_INCLUDE_AARCH32_REGS must be disabled")
 endif
+
+# Pointer Authentication sources
+ifeq (${ENABLE_PAUTH}, 1)
+PLAT_BL_COMMON_SOURCES	+=	plat/arm/common/aarch64/arm_pauth.c
+CTX_INCLUDE_PAUTH_REGS	:=	1
+endif
+
 endif