stm32mp1: Makefile cleanup

Don't compile psci for SPL build.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/mach-stm32mp/Makefile b/arch/arm/mach-stm32mp/Makefile
index ad5fd46..eee39c2 100644
--- a/arch/arm/mach-stm32mp/Makefile
+++ b/arch/arm/mach-stm32mp/Makefile
@@ -12,7 +12,8 @@
 else
 obj-y += bsec.o
 obj-$(CONFIG_CMD_STM32KEY) += cmd_stm32key.o
-endif
 obj-$(CONFIG_ARMV7_PSCI) += psci.o
+endif
+
 obj-$(CONFIG_$(SPL_)DM_REGULATOR) += pwr_regulator.o
 obj-$(CONFIG_OF_SYSTEM_SETUP) += fdt.o