aries-common: create uncompressed ramdisk

It is more efficient to let the kernel compress it only once.

See corresponding kernel commit:
https://gerrit.omnirom.org/7916

Build process warning
WARNING:  boot size (7475656) is 95.06% of limit (7864320)

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I8dcd03a4011367b68c96efb23f56348af12da79b