fix(bl32): always include arm_arch_svc in SP_MIN

The PSCI_FEATURES call implementation in TF-A always indicates support
for SMCCC_VERSION, but only BL31 ensures that the corresponding Arm
Architecture Service (arm_arch_svc) is really included in the build.
For SP_MIN only stm32mp1 currently includes it in the platform-specific
make file.

This means that it is easily possible to build configurations that
violate the PSCI/SMCCC specification. On Linux this leads to incorrect
detection of the SMC Calling Convention when using SP_MIN:

  [    0.000000] psci: SMC Calling Convention v65535.65535

Fix this by always including the Arm Architecture Service in SP_MIN
builds. This allows Linux to detect the convention correctly:

  [    0.000000] psci: SMC Calling Convention v1.4

Change-Id: Iaa3076c162b7a55633ec1e27eb5c44d22f8eb2a1
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
diff --git a/bl32/sp_min/sp_min.mk b/bl32/sp_min/sp_min.mk
index 0b7bc57..065468c 100644
--- a/bl32/sp_min/sp_min.mk
+++ b/bl32/sp_min/sp_min.mk
@@ -17,6 +17,7 @@
 				bl32/sp_min/aarch32/entrypoint.S	\
 				common/runtime_svc.c			\
 				plat/common/aarch32/plat_sp_min_common.c\
+				services/arm_arch_svc/arm_arch_svc_setup.c	\
 				services/std_svc/std_svc_setup.c	\
 				${PSCI_LIB_SOURCES}
 
diff --git a/plat/st/stm32mp1/sp_min/sp_min-stm32mp1.mk b/plat/st/stm32mp1/sp_min/sp_min-stm32mp1.mk
index f5184e7..9695c9b 100644
--- a/plat/st/stm32mp1/sp_min/sp_min-stm32mp1.mk
+++ b/plat/st/stm32mp1/sp_min/sp_min-stm32mp1.mk
@@ -48,6 +48,3 @@
 BL32_SOURCES		+=	plat/st/stm32mp1/services/bsec_svc.c		\
 				plat/st/stm32mp1/services/stm32mp1_svc_setup.c	\
 				plat/st/stm32mp1/stm32mp1_scmi.c
-
-# Arm Archtecture services
-BL32_SOURCES		+=	services/arm_arch_svc/arm_arch_svc_setup.c