firmware: helpers/config_loader: Also support bootvar0 eeprom config on Pi4

See: raspberrypi/rpi-eeprom#773

firmware: arm_loader: Add iommu_dma_numa_policy=interleave when needed

firmware: arm_loader: Switch sprintf to vcos_safe_sprintf

firmware: bootloader: Allow longer overlay file paths
See: raspberrypi/firmware#2004

firmware: arm_loader: Detect Manual and Auto-Focus V3 cameras using ID register

firmware: Add support for board_attributes in conditional expressions

firmware: board_info: Log the OTP board revision at startup

Author: popcornmix