drivers: pinctrl: kinetis: use clock control API

Remove the direct use of the HAL API to configure clocks and use
Zephyr's clock control API instead.

Currently the PORT peripherals of the Kinetis family are either
clocked by PCC in the case of KE1xF devices, or by SIM for the
rest of the devices. PCC clock driver converts internally the
subsys clock name into the clock gate address. SIM clock driver
expects this conversion to be done by the caller.

Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>