[//gpu] Add ClientSI DUMP_WILL_BE_CHECK that legacy MP is Ozone-only

This CL adds a DUMP_WILL_BE_CHECK() in ClientSI::GetTextureTarget()
that legacy multiplanar formats are supplied only on Ozone in
preparation for making this an invariant.

Bug: 41494843
Change-Id: I1600c63146461279b3b7c402dc9e496e87962fb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5424653


Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Auto-Submit: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#12826052}