Update *_TMPRING_SIZE.WAVESIZE for GFX11

The encoding of COMPUTE_TMPRING_SIZE.WAVESIZE and
SPI_TMPRING_SIZE.WAVESIZE has changed in GFX11: it is now in units
of 64 dwords instead of 256 dwords, and the field has been widened
from 13 bits to 15 bits.

Depends on D126989

Reviewed By: rampitec, arsenm, #amdgpu

Differential Revision: https://reviews.llvm.org/D127248