pinctrl: ultrarisc: Add UltraRISC DP1000 pinctrl driver

Add support for the pin controller on the UltraRISC DP1000 SoC.

The controller provides mux selection for pins in ports A, B, C, D, and
LPC.

pinctrl: ultrarisc: Add UltraRISC DP1000 pinctrl driver

Add support for the pin controller on the UltraRISC DP1000 SoC.

The controller provides mux selection for pins in ports A, B, C, D, and
LPC. Ports A-D default to GPIO and support peripheral muxing. LPC pins
can be switched to eSPI, but are not available as GPIOs. Basic pin
configuration controls such as drive strength, pull-up, and pull-down
are also supported.

Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>

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