Revert "drm/radeon: reduce number of free VMIDs and pipes in KV"

This reverts the remaining changes of commit
62a7b7fb

, because radeon doesn't support
amdkfd anymore. The number of VMIDs was already changed back when amdkfd
support was removed.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>