radeonsi: Implement PIPE_QUERY_TIMESTAMP

Signed-off-by: Niels Ole Salscheider <niels_ole@salscheider-online.de>
radeonsi: copy r600_get_timestamp

Signed-off-by: Niels Ole Salscheider <niels_ole@salscheider-online.de>
radeonsi: Handle additional PIPE_COMPUTE_CAP_*

This patch adds support for:
PIPE_COMPUTE_CAP_MAX_INPUT_SIZE
PIPE_COMPUTE_CAP_MAX_LOCAL_SIZE

Return the values reported by the closed source driver for now.

Signed-off-by: Niels Ole Salscheider <niels_ole@salscheider-online.de>