Expand the snapshot register dump helper function to support multiple sets of registers. This will be useful for derivative GPUS that use a global subset of registers and add a few new ones. This will not be useful for chipsets that have extensive changes to existing registers. Change-Id: Ic0dedbad05bcc3b5a3a0cc933659959965ff5817 Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> Signed-off-by: Rajeev Kulkarni <krajeev@codeaurora.org>