[HWUI] Use ANativeWindow_get{Height, Width}

gui/Surface will eventually be removed since HWUI needs to depend on a
stable ABI, so use the NDK methods for querying width and height that
operates on ANativeWindow instead.

Bug: 137012798
Test: builds
Change-Id: I1309e31992190e7b44c6ea83f962f372b6b0afcf