mach-snapdragon: implement capsule update support

Qualcomm boards flash U-Boot a variety of partitions, implement support
for determining which slot U-Boot is running from, finding the correct
partition for that slot and configuring the appropriate DFU string.

Initially, we only support the RB3 Gen 2 where U-Boot is flashed to the
UEFI partition, and ignore handling of slots. In the future we will
additionally support booting U-Boot from other partitions (e.g. boot)
and correct handling for A/B.

Reviewed-by: Neil Armstrong <[email protected]>
Acked-by: Ilias Apalodimas <[email protected]>
Signed-off-by: Caleb Connolly <[email protected]>

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