Make sure git config is set when applying patches

Fix serial number etc.

Bump dependencies

Fix reboot issue etc

Update config.txt to match edk2 example

See https://github.com/tianocore/edk2-platforms/blob/master/Platform/RaspberryPi/RPi4/Readme.md#booting-the-firmware

Fix network boot

Embedded ipxe.efidrv does not look up autoexec.ipxe from a removable media / network.

Embed iPXE binary inside EFI

This allows HTTP boot to work without local TFTP server.

Add boot.img for HTTP boot

Add NTP support & increase syslog verbosity

Add HTTPS support