Apply dummy SPI_PS_INPUT_CNTL_0 fix to gfx9+ too
Apply dummy SPI_PS_INPUT_CNTL_0 fix to gfx9+ too

For a fragment shader with no inputs, LLPC already had a fix to provide
a dummy SPI_PS_INPUT_CNTL_0 register for gfx6-8, as gfx7 at least
crashes without it.

This commit applies the same fix to gfx9+ too, as PAL expects it on all
arches, and gives a warning without it on a debug build.

Change-Id: I6582d6613605fb15eea631eb81b23f97ae56f62a

googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,googlestadia/llpc