Convert CONFIG_CMD_SH_ZIMAGEBOOT to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_SH_ZIMAGEBOOT

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/sh/Kconfig

@@ -128,6 +128,8 @@ config SYS_CPU
 	default "sh3" if CPU_SH3
 	default "sh4" if CPU_SH4
 
+source "arch/sh/lib/Kconfig"
+
 source "board/alphaproject/ap_sh4a_4a/Kconfig"
 source "board/espt/Kconfig"
 source "board/mpr2/Kconfig"

arch/sh/lib/Kconfig

+config CMD_SH_ZIMAGEBOOT
+	bool "zimageboot - Boot a zImage on SH"
+	default y
+	help
+	  This is special SH-specific command to boot a zImage (compressed
+	  Linux image) on SH-architecture boards.

include/configs/r2dplus.h

@@ -8,11 +8,6 @@
 
 #define CONFIG_DISPLAY_BOARDINFO
 
-/*
- * Command line configuration.
- */
-#define CONFIG_CMD_SH_ZIMAGEBOOT
-
 /* SCIF */
 #define CONFIG_CONS_SCIF1	1
 

include/configs/sh7785lcr.h

@@ -12,8 +12,6 @@
 #define CONFIG_CPU_SH7785	1
 #define CONFIG_SH7785LCR	1
 
-#define CONFIG_CMD_SH_ZIMAGEBOOT
-
 #define CONFIG_BOOTARGS		"console=ttySC1,115200 root=/dev/nfs ip=dhcp"
 
 #define CONFIG_EXTRA_ENV_SETTINGS					\

scripts/config_whitelist.txt

@@ -293,7 +293,6 @@ CONFIG_CM922T_XA10
 CONFIG_CMDLINE_EDITING
 CONFIG_CMDLINE_PS_SUPPORT
 CONFIG_CMDLINE_TAG
-CONFIG_CMD_SH_ZIMAGEBOOT
 CONFIG_CMD_SPL
 CONFIG_CMD_SPL_NAND_OFS
 CONFIG_CMD_SPL_WRITE_SIZE