kernel: disable non layout u-boot,env
All users of regular CONFIG_NVMEM_U_BOOOT_ENV have been converted to use
layouts.
CONFIG_NVMEM_U_BOOT_ENV selects the layout variant anyway so this is
safe to do.
Signed-off-by: Rosen Penev <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16376
Signed-off-by: Hauke Mehrtens <[email protected]>