Add partial pin control support for the imx8mp. Since the UART driver is
not currently enabled, pin control cannot be tested on this platform.
Therefore, only the DTS definitions required to set the pinmux options
are present for this platform, and are not being applied (since
CONFIG_PINCTRL=n).
Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
Add pin control group definitions for all iMX application cores. This
commit does not enable pin control for any iMX cores, as the SOC level
support is not present, but does define the require pin mux settings for
all boards.
Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>