arm64: dts: mt7986: add overlay for SATA power socket on BPI-R3

Bananapi R3 has a Power socket entended for using external SATA drives.
This Socket is off by default but can be switched with gpio 8.

Add an overlay to activate it.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20241206132401.70259-1-linux@fw-web.de


Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>