[magma] Increase notification read buffer to improve virtualization perf

Since mesa stopped tracking which buffers are associated with each
command buffer and started including all current buffers, the number
of notification buffer ids per command buffer for a complex app can
be in the hundreds.

Change-Id: I2d9139f6a897864da1a3edec99a0f2291638d9ec
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/456177
Reviewed-by: John Bauman <jbauman@google.com>
2 files changed