sysutils/rpi-firmware: Update to 1.20210111

While here also:
Replace the deprecated arm_control by arm_64bit for 64bits configuration
Add hdmi_safe for rpi4, recent updates of rpi-firmware break something related
to hdmi. Version 1.20201201 will reset if hdmi monitor is connected while later
version will only work if an hdmi monitor is connected. [1]

PR: 252971 [1]
MFH: 2021Q1