Convert CONFIG_CPU_SH7751 to Kconfig

This converts the following to Kconfig:
   CONFIG_CPU_SH7751

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 7836869..7e6cb70 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -4,13 +4,17 @@
 config CPU_SH4
 	bool
 
+config CPU_SH7751
+	bool
+	select CPU_SH4
+
 choice
 	prompt "Target select"
 	optional
 
 config TARGET_R2DPLUS
 	bool "Renesas R2D-PLUS"
-	select CPU_SH4
+	select CPU_SH7751
 
 endchoice
 
diff --git a/include/configs/r2dplus.h b/include/configs/r2dplus.h
index 680d16d..8e86830 100644
--- a/include/configs/r2dplus.h
+++ b/include/configs/r2dplus.h
@@ -1,7 +1,6 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
-#define CONFIG_CPU_SH7751	1
 #define __LITTLE_ENDIAN__	1
 
 /* SCIF */
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index 0587bf3..880937e 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -163,7 +163,6 @@
 CONFIG_CPU_PXA25X
 CONFIG_CPU_PXA26X
 CONFIG_CPU_PXA300
-CONFIG_CPU_SH7751
 CONFIG_CPU_TYPE_R
 CONFIG_CPU_VR41XX
 CONFIG_CQSPI_REF_CLK