Adjust vulkan memory allocation block size knobs to better match the type of draws we do.

We were allocating blocks significantly larger than the amount of memory we actually using
which caused us to end up wasting a lot of unused memory. This brings our allocation
sizes more inline with our uses.

Change-Id: I1b00670cfdfdb21884a4a203a1c35e183d83dbcf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209402
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
2 files changed