clk: sunxi-ng: a80-usb: Use local parent references for SUNXI_CCU_GATE

With the new clk parenting code and SUNXI_CCU_GATE macros, we can
reference parents locally via pointers to struct clk_hw or DT
clock-names.

Convert existing SUNXI_CCU_GATE definitions to SUNXI_CCU_GATE_DATA to
specify the parent clock.

Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>