Correct gic unit addresses to fix dtc W=1 warnings:

  alpine-v3.dtsi:321.38-331.5: Warning (simple_bus_reg): /soc/interrupt-controller@f0000000: simple-bus unit address format error, expected "f0800000"
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240402200744.79349-5-krzk@kernel.org