Remove some references to PLATFORM_SDK_VERSION am: 3769cd25f5 am: 370200000e am: 4ffed6d661

Original change: https://googleplex-android-review.googlesource.com/c/device/generic/goldfish-opengl/+/11444228

Change-Id: I4e594d4618ff0b2e3422a6756a31bd94af84aae7