... by only using the AHardwareBuffer_* functions which will
use the device's gralloc implementation.

Note: this change does not fix the 5 existing deqp failures
in the suballocated.* tests that are mentioned in b/169796031.

Note: ANGLE doesn't seem to have support for
VK_FORMAT_G8_B8_R8_3PLANE_420_UNORM yet: b/171302758.

Bug: b/141698760
Bug: b/147316305
Test: launch_cvd && cts -m CtsDeqpTestCases
  dEQP-VK.api.external.memory.android_hardware_buffer.*
Change-Id: Ia551e78198c20d6c40ffa9448418f73829da1880
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/49248
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Jason Macnak <natsu@google.com>
Reviewed-by: Trevor Black <vantablack@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>