Disable hardware rendering for PowerVR + ANGLE for Android <= 5.1.1

There are many PowerVR + ANGLE crashes on Android <= 5.1.1. We cannot
reproduce those crashes locally, so we have to disable hardware
rendering for now.

Bug: 1203652,1221321
Change-Id: Ie005c3792b4960aa31b3c38d148221fd7874d44b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3052558
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#905351}

gpu/config/software_rendering_list.json

@@ -1294,7 +1294,7 @@
       "cr_bugs": [710273],
       "os": {
         "type": "android",
-	"version": {
+        "version": {
           "op": "<",
           "value": "7.0"
         }
@@ -1553,6 +1553,22 @@
       "features": [
         "accelerated_video_decode"
       ]
+    },
+    {
+      "id": 168,
+      "description": "PowerVR Driver crashes with ANGLE",
+      "cr_bugs": [1203652,1221321],
+      "os": {
+        "type": "android",
+        "version": {
+          "op": "<=",
+          "value": "5.1.1"
+        }
+      },
+      "gl_renderer": "ANGLE (Imagination Technologies, PowerVR .*",
+      "features": [
+        "all"
+      ]
     }
   ]
 }