Add AVIF mime type to BitmapFactory

Associate SkEncodedImageFormat::kAVIF to "image/avif" mime type.

Avif mime type can be found in the specification here:
https://aomediacodec.github.io/av1-avif/#mime-registration

Test: Media cts tests still pass.
Test: Invoking ImageDecoder and BitmapFactory with an AVIF image
      returns the correct mime type.
Bug: 141654151
Change-Id: I0b67154a9031e1444912b59757e89cf625ee1280

libs/hwui/jni/BitmapFactory.cpp

@@ -67,6 +67,8 @@ const char* getMimeType(SkEncodedImageFormat format) {
             return "image/webp";
         case SkEncodedImageFormat::kHEIF:
             return "image/heif";
+        case SkEncodedImageFormat::kAVIF:
+            return "image/avif";
         case SkEncodedImageFormat::kWBMP:
             return "image/vnd.wap.wbmp";
         case SkEncodedImageFormat::kDNG: