amlogic: Fix prefixes in the SoC specific files

Remove the GXBB prefix where needed and add SoC specific prefixes for
GXBB/GXL.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: Ic3eb3a77ca2d9c779a9dee5cee786e9c16ecdb27
7 files changed