Re-enable AImageReader on Imagination and Nvidia GPUs.

Re-enable AImageReader on Imagination and Nvidia GPUs since few
bug fixes related to memory regressions have been landed and we
expect those fixes might have also fixed the crashes we were seeing.

Will need to revert this CL if it causes crashes. Since the crashes are
not reproducible locally, there is no other way to test this expect
removing the GPU family from the blacklist and hence enabling it on
ToT.

Bug: 1013797
Change-Id: Iec2c1b60d7e106e77011c65c260d49bead0edf54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1956279
Auto-Submit: vikas soni <vikassoni@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: vikas soni <vikassoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723344}

gpu/config/gpu_driver_bug_list.json

@@ -2949,30 +2949,6 @@
         "use_copyteximage2d_instead_of_readpixels_on_multisampled_textures"
       ]
     },
-    {
-      "id":281,
-      "cr_bugs": [838725],
-      "description": "Disable AImageReader on Imagination Technologies GPU as its buggy.",
-      "os": {
-        "type": "android"
-      },
-      "gl_vendor": "Imagination Technologies.*",
-      "features": [
-        "disable_aimagereader"
-      ]
-    },
-    {
-      "id":282,
-      "cr_bugs": [838725],
-      "description": "Disable AImageReader on NVIDIA GPU for as its buggy.",
-      "os": {
-        "type": "android"
-      },
-      "gl_vendor": "NVIDIA.*",
-      "features": [
-        "disable_aimagereader"
-      ]
-    },
     {
       "id": 283,
       "cr_bugs": [893177],