gralloc4: update lock support

In gralloc4, PlaneLayout information can be gotten by using
get(). It no longer makes sense to have a seperate and limited
lockYCbCr function or to return bytesPerPixel/bytesPerStride
function.

Bug: 141631415
Test: Can't be throughly tested until gralloc4 is implemented
Change-Id: I773cde065a92a1a0742944433969017dac17364a