With updated validation layers Vulkan backend is hitting two new
errors. This CL fixes one and works around (WA) another.

Fixes issue where a Buffer used in vkCmdDispatchIndirect() did
not have VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT set so now setting
that usage bit for all buffers.

WA issue where invalid topologies enabled primitiveRestart so
ignoring that VUID initially until complete fix is implemented.

Bug: angleproject:3832
Change-Id: Ie3f681eaf9e2051c27bdf00a35dc50d8ad4a2528
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1763196Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Tobin Ehlis <tobine@google.com>