linux-raspberrypi: Upgrade to 4.19.57
linux-raspberrypi: Upgrade to 4.19.57

Fixes vc4 graphics issues seen with 4.19.56
Add -@ to device tree flags so we can debug/dump the
dtb with symbols, helps in debugging the overlays

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

agherzan/meta-raspberrypi,schnitzeltony/meta-raspberrypi,agherzan/meta-raspberrypi,schnitzeltony/meta-raspberrypi,leon-anavi/meta-raspberrypi,agherzan/meta-raspberrypi,leon-anavi/meta-raspberrypi,schnitzeltony/meta-raspberrypi,leon-anavi/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi