sh: Add support for SH7721 CPU subtype.

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 538631c..d2f5577 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -214,6 +214,13 @@
 	help
 	  Select SH7720 if you have a SH3-DSP SH7720 CPU.
 
+config CPU_SUBTYPE_SH7721
+	bool "Support SH7721 processor"
+	select CPU_SH3
+	select CPU_HAS_DSP
+	help
+	  Select SH7721 if you have a SH3-DSP SH7721 CPU.
+
 # SH-4 Processor Support
 
 config CPU_SUBTYPE_SH7750