refactor(smccc): refactor vendor-el3 build

Currently we are building vendor-specific EL3 by default similar to
arm-sip but unfortunately this causes few troubles for now.

- Few model builds configuration like 'fvp-dynamiq-aarch64-only'
  is on 256KB SRAM border and this configuration is also run on some
  older models like A710 and N2, so we cant move them to 384KB SRAM size
  and to new model.

- Not able to move some older model builds to new model due to known
  issue in power modelling in some of the models, making it difficult to
  transition.

However vendor-specific EL3 is currently using PMF, DEBUGFS so building
the vendor EL3 support only when any of this sub-service is built also
helps to avoid bloating BL31 image size in certain configurations.

However this is not end of road, we will monitor how vendor-specific EL3
grows with sub-service and if needed will make this interface to built
by default like arm-sip range. Also this doesn't stop platform owners to
make vendor-specific EL3 to be enabled by default for their platform
configuration.

Change-Id: I23322574bdeb7179441a580ad4f093216a948bbf
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>

bl31/bl31.mk

@@ -45,7 +45,6 @@ BL31_SOURCES		+=	bl31/bl31_main.c				\
 				lib/cpus/aarch64/dsu_helpers.S			\
 				plat/common/aarch64/platform_mp_stack.S		\
 				services/arm_arch_svc/arm_arch_svc_setup.c	\
-				services/el3/ven_el3_svc.c			\
 				services/std_svc/std_svc_setup.c		\
 				${PSCI_LIB_SOURCES}				\
 				${SPMD_SOURCES}					\
@@ -53,13 +52,17 @@ BL31_SOURCES		+=	bl31/bl31_main.c				\
 				${SPMC_SOURCES}					\
 				${SPM_SOURCES}
 
+VENDOR_EL3_SRCS		+=	services/el3/ven_el3_svc.c
+
 ifeq (${ENABLE_PMF}, 1)
-BL31_SOURCES		+=	lib/pmf/pmf_main.c
+BL31_SOURCES		+=	lib/pmf/pmf_main.c				\
+				${VENDOR_EL3_SRCS}
 endif
 
 include lib/debugfs/debugfs.mk
 ifeq (${USE_DEBUGFS},1)
-	BL31_SOURCES	+= $(DEBUGFS_SRCS)
+BL31_SOURCES		+=	${DEBUGFS_SRCS}					\
+				${VENDOR_EL3_SRCS}
 endif
 
 ifeq (${PLATFORM_REPORT_CTX_MEM_USE},1)

bl32/sp_min/sp_min.mk

@@ -18,12 +18,12 @@ BL32_SOURCES		+=	bl32/sp_min/sp_min_main.c			\
 				common/runtime_svc.c				\
 				plat/common/aarch32/plat_sp_min_common.c	\
 				services/arm_arch_svc/arm_arch_svc_setup.c	\
-				services/el3/ven_el3_svc.c			\
 				services/std_svc/std_svc_setup.c		\
 				${PSCI_LIB_SOURCES}
 
 ifeq (${ENABLE_PMF}, 1)
-BL32_SOURCES		+=	lib/pmf/pmf_main.c
+BL32_SOURCES		+=	services/el3/ven_el3_svc.c			\
+				lib/pmf/pmf_main.c
 endif
 
 ifneq (${ENABLE_FEAT_AMU},0)