kirkwood: kwbimage: refactor CONFIG_SYS_KWD_CONFIG

Pull out "$(SRCTREE)/" from CONFIG_SYS_KWD_CONFIG
and push it into the top Makefile.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Michael Walle <michael@walle.cc>
Cc: Simon Guinot <simon.guinot@sequanux.org>
Cc: Dave Purdy <david.c.purdy@gmail.com>
Cc: Stefan Herbrechtsmeier <stefan@herbrechtsmeier.net>
Cc: Luka Perkov <luka@openwrt.org>
Cc: Valentin Longchamp <valentin.longchamp@keymile.com>
Cc: Jason Cooper <u-boot@lakedaemon.net>
Cc: Siddarth Gore <gores@marvell.com>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Cc: Eric Cooper <ecc@cmu.edu>
Cc: Suriyan Ramasami <suriyan.r@gmail.com>
diff --git a/include/configs/km_kirkwood.h b/include/configs/km_kirkwood.h
index 2cde177..9eb1ad3 100644
--- a/include/configs/km_kirkwood.h
+++ b/include/configs/km_kirkwood.h
@@ -40,8 +40,7 @@
 #define CONFIG_IDENT_STRING		"\nKeymile Kirkwood 128M16"
 #define CONFIG_HOSTNAME			km_kirkwood_128m16
 #undef CONFIG_SYS_KWD_CONFIG
-#define CONFIG_SYS_KWD_CONFIG \
-		$(SRCTREE)/$(CONFIG_BOARDDIR)/kwbimage_128M16_1.cfg
+#define CONFIG_SYS_KWD_CONFIG $(CONFIG_BOARDDIR)/kwbimage_128M16_1.cfg
 #define CONFIG_KM_DISABLE_PCIE
 #define CONFIG_KM_IVM_BUS		1	/* I2C2 (Mux-Port 1)*/
 
@@ -59,8 +58,7 @@
 #endif
 
 #undef CONFIG_SYS_KWD_CONFIG
-#define CONFIG_SYS_KWD_CONFIG \
-		$(SRCTREE)/$(CONFIG_BOARDDIR)/kwbimage_128M16_1.cfg
+#define CONFIG_SYS_KWD_CONFIG $(CONFIG_BOARDDIR)/kwbimage_128M16_1.cfg
 #define CONFIG_KM_ENV_IS_IN_SPI_NOR
 #define CONFIG_KM_FPGA_CONFIG
 #define CONFIG_KM_PIGGY4_88E6352
@@ -73,8 +71,7 @@
 #define CONFIG_HOSTNAME			mgcoge3un
 #define CONFIG_KM_IVM_BUS		1	/* I2C2 (Mux-Port 1)*/
 #undef CONFIG_SYS_KWD_CONFIG
-#define CONFIG_SYS_KWD_CONFIG \
-		$(SRCTREE)/$(CONFIG_BOARDDIR)/kwbimage-memphis.cfg
+#define CONFIG_SYS_KWD_CONFIG $(CONFIG_BOARDDIR)/kwbimage-memphis.cfg
 #define CONFIG_KM_BOARD_EXTRA_ENV	"waitforne=true\0"
 #define CONFIG_PIGGY_MAC_ADRESS_OFFSET  3
 #define CONFIG_KM_DISABLE_PCIE
@@ -85,8 +82,7 @@
 #define CONFIG_IDENT_STRING		"\nKeymile COGE5UN"
 #define CONFIG_KM_IVM_BUS		1	/* I2C2 (Mux-Port 1)*/
 #undef	CONFIG_SYS_KWD_CONFIG
-#define CONFIG_SYS_KWD_CONFIG \
-		$(SRCTREE)/$(CONFIG_BOARDDIR)/kwbimage_256M8_1.cfg
+#define CONFIG_SYS_KWD_CONFIG $(CONFIG_BOARDDIR)/kwbimage_256M8_1.cfg
 #define CONFIG_KM_ENV_IS_IN_SPI_NOR
 #define CONFIG_PIGGY_MAC_ADRESS_OFFSET	3
 #define CONFIG_HOSTNAME			kmcoge5un
@@ -106,8 +102,7 @@
 #define CONFIG_IDENT_STRING		"\nKeymile SUV31"
 #define CONFIG_HOSTNAME			kmsuv31
 #undef CONFIG_SYS_KWD_CONFIG
-#define CONFIG_SYS_KWD_CONFIG \
-		$(SRCTREE)/$(CONFIG_BOARDDIR)/kwbimage_128M16_1.cfg
+#define CONFIG_SYS_KWD_CONFIG $(CONFIG_BOARDDIR)/kwbimage_128M16_1.cfg
 #define CONFIG_KM_ENV_IS_IN_SPI_NOR
 #define CONFIG_KM_FPGA_CONFIG