Added new kernel-dtbs target to speed up execution of uboot-deb and uboot-image targets. As this only build kernel dtbs instead of the complete kernel, it saves a lot of time when doing uboot specific development and testing
Reverted mainline kernel support for vim4. The mainline 6.4 kernel doesn't have vim4 dts or defconfig and does not build. Hence removing the same
Also we ask to select u-boot version even when only single uboot version is available. So I have made the behavior consistent with Linux kernel selection where we automatically select the only available option
Bunch of minor fixes