sh: Add support for SH7206 and SH7619 CPU subtypes.

This implements initial support for the SH7206 (SH-2A) and SH7619
(SH-2) MMU-less CPUs.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 9dd6064..814a1758 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -4,8 +4,12 @@
 # Processor families
 #
 config CPU_SH2
+	select SH_WRITETHROUGH if !CPU_SH2A
 	bool
-	select SH_WRITETHROUGH
+
+config CPU_SH2A
+	bool
+	select CPU_SH2
 
 config CPU_SH3
 	bool
@@ -40,6 +44,16 @@
 	bool "Support SH7604 processor"
 	select CPU_SH2
 
+config CPU_SUBTYPE_SH7619
+	bool "Support SH7619 processor"
+	select CPU_SH2
+
+comment "SH-2A Processor Support"
+
+config CPU_SUBTYPE_SH7206
+	bool "Support SH7206 processor"
+	select CPU_SH2A
+
 comment "SH-3 Processor Support"
 
 config CPU_SUBTYPE_SH7300
@@ -274,7 +288,6 @@
 
 config SH_WRITETHROUGH
 	bool "Use write-through caching"
-	default y if CPU_SH2
 	help
 	  Selecting this option will configure the caches in write-through
 	  mode, as opposed to the default write-back configuration.