ExifInterface: Accept decimal values for RATIONAL formats

Prior to android N, ExifInterface.setAttributes() accepted the
decimal values for SRATIONAL/URATIONAL formats. However in android N,
decimal values for RATIONAL formats are rejected. Since this behavior
breaks the backward compatibility, we should make setAttributes()
accept decimal values as before.

Bug: 34269464
Test: flashed modified build on angler and tested with an app
Change-Id: I9a77ce341c8c8c3ea74c8592b5a821243eb0257d