Fix ordering of RGP image layout markers
Fix ordering of RGP image layout markers

In every other case, `DescribeBarrier` is called first (recording the
layout transition marker for RGP), followed by the recording of the
actual layout transition events. In this case, `DescribeBarrier` is
called *after* `InitMaskRam`, so the layout transition marker comes
after the corresponding events.

GPUOpen-Drivers/pal,GPUOpen-Drivers/pal,googlestadia/pal,googlestadia/pal,googlestadia/pal,GPUOpen-Drivers/pal,GPUOpen-Drivers/pal