omap_dri2: remove unused field from SwapCmd
omap_dri2: remove unused field from SwapCmd

crtc_id isn't used, since it is possible for a singe SwapCmd to perform
a page flip on multiple CRTCs.

** No functional change

Signed-off-by: Daniel Kurtz <31914e832df1cd8e5daa417106c0c6f5297b27d7@chromium.org>

BUG=none
TEST=builds clean

Change-Id: I252106e232a51d8df6cd787b76a4add7916378c8
Reviewed-on: https://chromium-review.googlesource.com/190687
Reviewed-by: John Sheu <e133b36fa071c0f7efb4cebd35fa1371d3ae789d@chromium.org>
Tested-by: Daniel Kurtz <31914e832df1cd8e5daa417106c0c6f5297b27d7@chromium.org>
Reviewed-by: Dominik Behr <e7ce582c7d62326af1f467203edc40f69ba4f78f@chromium.org>
Commit-Queue: Daniel Kurtz <31914e832df1cd8e5daa417106c0c6f5297b27d7@chromium.org>

markyzq/armsoc-rockchip,markyzq/armsoc-rockchip