etnaviv: separate PE and RS formats, use only RS only for tiling

etnaviv: separate PE and RS formats, use only RS only for tiling

There are PE formats not supported by RS, so we can't have a single
to translate both.

Use RS only for same formats until we have a translate_rs_format and test
the possible different format blits.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>