arm64: dts: bitmain: lowercase unit addresses

Unit addresses are expected to be lower case. Pointed also by W=1
builds:

Warning (simple_bus_reg): /soc/serial@5801A000: simple-bus unit address fo

arm64: dts: bitmain: lowercase unit addresses

Unit addresses are expected to be lower case. Pointed also by W=1
builds:

Warning (simple_bus_reg): /soc/serial@5801A000: simple-bus unit address format error, expected "5801a000"

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>

show more ...