km/scripts: replace hardcoded uImage

Replace uImage with ${uimage}.
If uimage is not set, default it to uImage.
Signed-off-by: NAndreas Huber <andreas.huber@keymile.com>
Signed-off-by: NHolger Brunck <holger.brunck@keymile.com>

board/keymile/scripts/develop-common.txt

 altbootcmd=run ${subbootcmds}
 bootcmd=run ${subbootcmds}
-configure=km_setboardid && saveenv && reset
+configure=run set_uimage; km_setboardid && saveenv && reset
 subbootcmds=tftpfdt tftpkernel nfsargs add_default boot
 nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=${serverip}:${toolchain}/${arch}
-tftpkernel=tftpboot ${load_addr_r} ${hostname}/uImage
+tftpkernel=tftpboot ${load_addr_r} ${hostname}/${uimage}
 toolchain=/opt/eldk
 rootfssize=0
+set_uimage=printenv uimage || setenv uimage uImage

board/keymile/scripts/ramfs-common.txt

@@ -4,8 +4,9 @@ altbootcmd=run ${subbootcmds}
 bootcmd=run ${subbootcmds}
 subbootcmds=tftpfdt tftpkernel setrootfsaddr tftpramfs flashargs add_default addpanic addramfs boot
 nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=${serverip}:${rootpath}
-configure=km_setboardid && saveenv && reset
+configure=run set_uimage; km_setboardid && saveenv && reset
 rootfsfile=${hostname}/rootfsImage
 setrootfsaddr=setexpr value ${pnvramaddr} - ${rootfssize} && setenv rootfsaddr 0x${value}
-tftpkernel=tftpboot ${load_addr_r} ${hostname}/uImage
+tftpkernel=tftpboot ${load_addr_r} ${hostname}/${uimage}
 tftpramfs=tftpboot ${rootfsaddr} ${hostname}/rootfsImage
+set_uimage=printenv uimage || setenv uimage uImage