[gl] Disable direct glMapBufferRange for now

Fixes: 123035807

- Performance issue from thrashing KVM slots
- Crash when an old mapping did not get removed from KVM
- Need direct mem to be enabled for Vulkan support
- In the future, rethink the feature in terms of suballocating a large
persistently mapped GL buffer

Change-Id: I50c36e406aa54f91b2e0630988160e95ccf7074f
1 file changed