tests: add zephyr pinmux driver api test case

This commit verifies the following pinmux driver apis:
	pinmux_pin_set()
	pinmux_pin_get()

Change-Id: Iedf1b4e918b518b2205e9059b3b08f41cd243d37
Signed-off-by: Qiu Peiyang <peiyangx.qiu@intel.com>
15 files changed