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arm64: dts: librem5-r3: Mark buck3 as always on

Sebastian Krzyszkowiak requested to merge sebastian.krzyszkowiak/linux-next:dogwood-buck3 into imx8-current-librem5

Commit 66d3f246 (!279 (merged)) removed always-on marking from GPU regulator, which is great for power saving - however, it introduces additional i2c0 traffic which can be deadly for devices from the Dogwood batch.

To workaround the i2c0 shutdown issue on Dogwood, this commit marks buck3 as always-on again - but only for Dogwood (r3).

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