Convert CONFIG_SYS_KWD_CONFIG to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_KWD_CONFIG

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b828b8d..7264d72 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -2052,6 +2052,14 @@
 	  image headers.
 endif
 
+config SYS_KWD_CONFIG
+	string "kwbimage config file path"
+	depends on ARCH_KIRKWOOD || ARCH_MVEBU
+	default "arch/arm/mach-mvebu/kwbimage.cfg"
+	help
+	  Path within the source directory to the kwbimage.cfg file to use
+	  when packaging the U-Boot image for use.
+
 source "arch/arm/mach-apple/Kconfig"
 
 source "arch/arm/mach-aspeed/Kconfig"
diff --git a/arch/arm/mach-kirkwood/include/mach/config.h b/arch/arm/mach-kirkwood/include/mach/config.h
index 9fd9061..eb95023 100644
--- a/arch/arm/mach-kirkwood/include/mach/config.h
+++ b/arch/arm/mach-kirkwood/include/mach/config.h
@@ -27,15 +27,6 @@
 #define CONFIG_KIRKWOOD_RGMII_PAD_1V8	/* Set RGMII Pad voltage to 1.8V */
 #define CONFIG_KIRKWOOD_PCIE_INIT       /* Enable PCIE Port0 for kernel */
 
-/*
- * By default kwbimage.cfg from board specific folder is used
- * If for some board, different configuration file need to be used,
- * CONFIG_SYS_KWD_CONFIG should be defined in board specific header file
- */
-#ifndef CONFIG_SYS_KWD_CONFIG
-#define	CONFIG_SYS_KWD_CONFIG	$(CONFIG_BOARDDIR)/kwbimage.cfg
-#endif /* CONFIG_SYS_KWD_CONFIG */
-
 /* Kirkwood has 2k of Security SRAM, use it for SP */
 #define CONFIG_SYS_INIT_SP_ADDR		0xC8012000
 
diff --git a/arch/arm/mach-mvebu/include/mach/config.h b/arch/arm/mach-mvebu/include/mach/config.h
index 6ecd394..681f649 100644
--- a/arch/arm/mach-mvebu/include/mach/config.h
+++ b/arch/arm/mach-mvebu/include/mach/config.h
@@ -27,15 +27,6 @@
 
 #define CONFIG_SYS_L2_PL310
 
-/*
- * By default the generated mvebu kwbimage.cfg is used
- * If for some board, different configuration file need to be used,
- * CONFIG_SYS_KWD_CONFIG should be defined in board specific header file
- */
-#ifndef CONFIG_SYS_KWD_CONFIG
-#define	CONFIG_SYS_KWD_CONFIG	arch/arm/mach-mvebu/kwbimage.cfg
-#endif /* CONFIG_SYS_KWD_CONFIG */
-
 /* end of 16M scrubbed by training in bootrom */
 #define CONFIG_SYS_INIT_SP_ADDR		0x00FF0000