panfrost: add missing 4-bit formats
We were missing a couple of 4-bit formats, let's add the missing ones.
This fixes dEQP-VK.api.info.format_properties.b4g4r4a4_unorm_pack16
for
PanVK, because we already exposed the feature-bit for one of the formats,
but failed to report the required features for it.
Edited by Erik Faye-Lund