test: pinmux: add test for 'pinctrl-single' driver
The test adds two pinmux nodes to the device tree, one to test when a register changes only one pin's mux (pinctrl-single,pins), and the other to test when more than one pin's mux is changed (pinctrl-single,bits). This required replacing the controller's register access functions when the driver is used on sandbox. Signed-off-by: NDario Binacchi <dariobin@libero.it> Reviewed-by: NSimon Glass <sjg@chromium.org>
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