drivers: move scmi-msg out of st

Make the scmi-msg driver reused by others.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Change-Id: I5bc35fd4dab70f45c09b8aab65af4209cf23b124
diff --git a/plat/st/stm32mp1/sp_min/sp_min-stm32mp1.mk b/plat/st/stm32mp1/sp_min/sp_min-stm32mp1.mk
index 8866fb5..4d4820a 100644
--- a/plat/st/stm32mp1/sp_min/sp_min-stm32mp1.mk
+++ b/plat/st/stm32mp1/sp_min/sp_min-stm32mp1.mk
@@ -26,11 +26,11 @@
 BL32_SOURCES		+=	plat/common/plat_psci_common.c
 
 # SCMI server drivers
-BL32_SOURCES		+=	drivers/st/scmi-msg/base.c		\
-				drivers/st/scmi-msg/clock.c		\
-				drivers/st/scmi-msg/entry.c		\
-				drivers/st/scmi-msg/reset_domain.c	\
-				drivers/st/scmi-msg/smt.c
+BL32_SOURCES		+=	drivers/scmi-msg/base.c		\
+				drivers/scmi-msg/clock.c		\
+				drivers/scmi-msg/entry.c		\
+				drivers/scmi-msg/reset_domain.c	\
+				drivers/scmi-msg/smt.c
 
 # stm32mp1 specific services
 BL32_SOURCES		+=	plat/st/stm32mp1/services/bsec_svc.c		\