recipies-kernel/linux: No longer use LINUX_VERSION_EXTENSION.
recipies-kernel/linux: No longer use LINUX_VERSION_EXTENSION.

This version is already generated by linux build system and concatenated to the
current version (for next).

twoerner/meta-rockchip-twoerner,hizukiayaka/meta-rockchip,hizukiayaka/meta-rockchip,twoerner/meta-rockchip-twoerner,hizukiayaka/meta-rockchip