buildroot

Revert "linux: only depend on host-lzop if needed"

This reverts commit ca80782f4571f004c2b8cf2d0e60e83343beff34. The
whole host-lzop optional dependency logic cannot work, since the
configuration file will only be known after the kernel sources are
extracted, if an internal kernel defconfig is used, which is quite
common.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>