board: silinux: Enable recovery SPL for EK874 board

Enable building SPL for EK874 board which is based on R8A774C0 SoC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
diff --git a/arch/arm/mach-rmobile/Makefile b/arch/arm/mach-rmobile/Makefile
index 3206bce..9f56af4 100644
--- a/arch/arm/mach-rmobile/Makefile
+++ b/arch/arm/mach-rmobile/Makefile
@@ -22,7 +22,7 @@
 spl/u-boot-spl.srec: spl/u-boot-spl FORCE
 	$(call if_changed,objcopy)
 
-ifneq ($(CONFIG_R8A77990)$(CONFIG_R8A77995),)
+ifneq ($(CONFIG_R8A774C0)$(CONFIG_R8A77990)$(CONFIG_R8A77995),)
 #
 # The first 6 generate statements generate the R-Car Gen3 SCIF loader header.
 # The subsequent generate statements represent the following chunk of assembler