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We recently enabled Vulkan build by default. However, in the Vulkan code
is "mips" which is #define mips 1 on MIPS builds.

It is easy enough to just rename this instance to mip_levels. It is also
more descriptive anyway. And then it fixes builds targetting MIPS chips.

BUG=853174

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I45b75b4deaa8c95fba47e8958d9283c49a5f405f
Reviewed-on: https://chromium-review.googlesource.com/1102672Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Chris Blume <cblume@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567809}