sh: intc - add support for x3

This patch converts the cpu specific interrupt setup code for x3 from
intc2 to intc. New vectors are also added to match the preliminary
information.

Use plat_irq_setup_pins() to select between IRQ and IRL mode for IRQ0-3.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index c35ba72..d1a7e3f 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -197,7 +197,7 @@
 	bool "Support SH-X3 processor"
 	select CPU_SH4A
 	select CPU_SHX3
-	select CPU_HAS_INTC2_IRQ
+	select CPU_HAS_INTC_IRQ
 
 # SH4AL-DSP Processor Support