tegra: image: remove unnecessary assumptions from bootscript

'bootz' expects gziped kernel image anyway, so hard-code it to zImage,
and remove root path from 'load' commands, by default the files are
searched in root directory.

This will make the bootscript static, so the command which modified it
when image was created can now be removed.

Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>

target/linux/tegra/image/Makefile

@@ -14,10 +14,9 @@ define Build/tegra-sdcard
 	$(if $(DEVICE_DTS),\
 		$(foreach dtb,$(DEVICE_DTS),$(CP) $(DTS_DIR)/$(dtb).dtb $@.boot), \
 		$(CP) $(DTS_DIR)/*.dtb $@.boot)
-	sed -e 's#@KERNEL@#$(KERNEL_NAME)#g' $(BOOT_SCRIPT) > $@-boot.scr
 	mkimage -A arm -O linux -T script -C none -a 0 -e 0 \
 		-n '$(DEVICE_TITLE) OpenWrt bootscript' \
-		-d $@-boot.scr \
+		-d $(BOOT_SCRIPT) \
 		$@.boot/boot.scr
 
 	SIGNATURE="$(IMG_PART_SIGNATURE)" \

target/linux/tegra/image/generic-bootscript

@@ -2,7 +2,7 @@ part uuid ${devtype} ${devnum}:2 ptuuid
 
 setenv bootargs "root=PARTUUID=${ptuuid} rw rootwait console=ttyS0,115200 console=tty0"
 
-load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} /@KERNEL@
-load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} /${soc}-${board}.dtb
+load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} zImage
+load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} ${soc}-${board}.dtb
 
 bootz ${kernel_addr_r} - ${fdt_addr_r}