freedreno: Rename CP_SET_CTXSWITCH_IB to CP_SET_AMBLE
What does this MR do and why?
freedreno: Rename CP_SET_CTXSWITCH_IB to CP_SET_AMBLE
To match kgsl. Also make KMD_AMBLE_TYPE match the kgsl name, and invent
some names for the other types to be consistent.
This is split out of !30544 because it turns out it also needs to be used by the kernel side.