ARM: shmobile: Select IRQC in case of the r8a7791 SoC

The r8a7791 contains IRQC hardware so make sure
the driver gets built by selecting RENESAS_IRQC.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/Kconfig

@@ -100,6 +100,7 @@ config ARCH_R8A7791
 	select ARM_GIC
 	select CPU_V7
 	select SH_CLK_CPG
+	select RENESAS_IRQC
 
 config ARCH_EMEV2
 	bool "Emma Mobile EV2"