lxc-alpine: Add support for ppc64le
lxc-alpine: Add support for ppc64le

Starting at version 3.6, Alpine Linux has support for ppc64le
architecture. Adding the new keys also.

Signed-off-by: Breno Leitao <ba79d1bc600b011cc5b968b08e31479ef84ac520@gmail.com>

ss1h2a3tw/lxc,aeris/lxc,LynxChaus/lxc,aeris/lxc,terceiro/lxc,federicobriata/lxc,caglar10ur/lxc,hallyn/lxc,federicobriata/lxc,aeris/lxc,LynxChaus/lxc,thmo/lxc,ss1h2a3tw/lxc,caglar10ur/lxc,terceiro/lxc,terceiro/lxc,hallyn/lxc,ss1h2a3tw/lxc,LynxChaus/lxc,caglar10ur/lxc,thmo/lxc,federicobriata/lxc,thmo/lxc,hallyn/lxc