Update raspberrypi firmware to 20210527
Update raspberrypi firmware to 20210527

Signed-off-by: Omer Akram <6a2b3fa376eaaefa628ba0e36b601bb1adab5658@thing.com>

agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi