package/rpi-firmware: bump version for rpi0
Although the current version of rpi-firmware we use is working just fine
on the rpi-zero, the latest firmware provides a DTB overlay to use the
USB OTG device in either host or slave modes.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>