pinctrl: uniphier: Separate modem group from UART ctsrts group

It depends on the board implementation whether to have each pins of
CTS/RTS, and others for modem. So it is necessary to divide current
uart_ctsrts group into uart_ctsrts and uart_modem groups.

Since the number of implemented pins for modem differs depending
on SoC, each uart_modem group also has a different number of pins.

Signed-off-by: Kunihiko Hayashi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Masahiro Yamada <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

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