warp7: Make CONFIG_SYS_FDT_ADDR a define

In order to sign images with the IMX code-signing-tool (CST) we need to
know the load address of a given image. The best way to derive this load
address is to make it into a define - so that u-boot.cfg contains the
address - which we can then parse when generating the IMX CST headers.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Ryan Harkin <ryan.harkin@linaro.org>
Tested-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

board/warp7/Kconfig

@@ -6,4 +6,10 @@ config SYS_BOARD
 config SYS_CONFIG_NAME
 	default "warp7"
 
+config SYS_FDT_ADDR
+	hex "FDT load address"
+	default 0x83000000
+	help
+	  The address the FDT file should be loaded to.
+
 endif

include/configs/warp7.h

@@ -39,7 +39,7 @@
 	"fdt_high=0xffffffff\0" \
 	"initrd_high=0xffffffff\0" \
 	"fdt_file=imx7s-warp.dtb\0" \
-	"fdt_addr=0x83000000\0" \
+	"fdt_addr=" __stringify(CONFIG_SYS_FDT_ADDR)"\0" \
 	"optee_addr=" __stringify(CONFIG_OPTEE_LOAD_ADDR)"\0" \
 	"boot_fdt=try\0" \
 	"ip_dyn=yes\0" \