dt-bindings: soc: hisilicon: document hi3660-usb3-otg-bc

Add dedicated bindings for the Hisilicon Kirin 960 USB OTG Syscon,
to fully document the block and also fix dtbs_check warning:

hi3660-hik

dt-bindings: soc: hisilicon: document hi3660-usb3-otg-bc

Add dedicated bindings for the Hisilicon Kirin 960 USB OTG Syscon,
to fully document the block and also fix dtbs_check warning:

hi3660-hikey960.dtb: usb3_otg_bc@ff200000: compatible: ['syscon', 'simple-mfd'] is too short

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

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