sunxi rtxx7x: Weed out some Makefile junk.
sunxi usb: Make HCD0 boolean.
sunxi: disp: Fix HDMI build - requires HDMI audio.
Rename sun5i defconfigs.

 - add sun5i prefix
 - a12 -> a10s
sunxi: add kitchensink to defconfig.

v2 rebase on USB config hack
v3 make separate config for a10s/a13
v4 split off rename into separate commit