Revert "defconfigs: use LZ4 compression for kernel & ramdisk"

Seems to make boot times slower.

This reverts commit 95ee94567b82e90e4d7d12a190407579dd0e1588.

Change-Id: Idbc6271fa71c9eff712146b1b4ae20618e15dc82
defconfigs: switch kernel compression to LZO

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I545c1d7741e6edb388500ae5cc04eec6be7a4704