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Allwinner H6 SoC has a totally different memory map and different clock
control unit with other SoCs.

Add support for it in uart0-helloworld-sdboot.

To avoid writing blindly into the device MMIO area first (for triggering
the SRAM version register), we query the known content of some GIC register
to verify we are looking at an H6 memory map.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Andre Przywara <osp@andrep.de>