nit6xlite: Fix comments in nit6xlite.h
nit6xlite: fix default panel selection, 24-bit RGB for 480x272 panel
nitrogen6x/nit6xlite: Always configure RGB pads

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
oc: Boundary Devices OC board doesn't expose RGB pins

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nit6xlite android bootscript: Allow override for common panels
Removed internal cache_flush operations and placed a flush of the
entire frame-buffer at the end of each public function.

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>