pinctrl: sunxi: a64: Rename function ts0 to ts

The A64 only has one TS (transport stream) controller. The datasheet
also lists the function as TS_XXX instead of TS0_XXX.

Rename the function names now before any there are any users.

Fixes: 96851d39 ("drivers: pinctrl: add driver for Allwinner A64 SoC")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>