cros-build/firmware/coral.bin: Support for large payloads

This replaces the coral FW image with one that adds a commit by Julius
Werner (45f2be285df6c78b657304198d736e33a9992cc2) to increase the
allowed payload size of Depthcharge. This change was already present in
the firmwares of grunt, rammus and octopus, but missing in
coral. Depthcharge can now download up to 512MB of kernel + ramdisk
data.

Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com>