m3: change gradient_drawable_shape_rounded_cap namespace to wear

name change: gradient_drawable_shape_rounded_cap -> gradient_drawable_shape_arc_for_rounded_cap
namespace change: core_graphics -> wear_frameworks

Test: build
Flag: com.android.graphics.flags.gradient_drawable_shape_arc_for_rounded_cap
Bug: 380000245
Change-Id: I9520a1d9170c2ebcfffcb9396a3fb80b55665fc0