Guard invalidate() calls from corner radii callback with flag

Bug: 439330613
Flag:com.android.graphics.surfaceflinger.flags.set_client_drawn_corner_radii
Test: launcher-quickstep-jank-suite; systemui-splitscreen-3-jank-suite
Change-Id: Iea53664ec4fe9c800328df15095f349d9f39a5ab