sh: Preliminary support for the SH-X3 CPU.

This adds basic support for UP SH-X3.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 6fc5550..ea1d271 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -36,6 +36,9 @@
 config CPU_SHX2
 	bool
 
+config CPU_SHX3
+	bool
+
 choice
 	prompt "Processor sub-type selection"
 
@@ -193,6 +196,12 @@
 	select CPU_SHX2
 	select CPU_HAS_INTC2_IRQ
 
+config CPU_SUBTYPE_SHX3
+	bool "Support SH-X3 processor"
+	select CPU_SH4A
+	select CPU_SHX3
+	select CPU_HAS_INTC2_IRQ
+
 # SH4AL-DSP Processor Support
 
 config CPU_SUBTYPE_SH73180