drivers: spi: Added MEC172x full duplex qmspi driver

Add MEC172x full duplex qmspi driver version to support full
duplex transfers as expected by the Zephyr spi driver model.
On every spi clock we transmit one bit and receive one bit.
This driver will work with Zephyr SPI NOR driver.

Signed-off-by: Jay Vasanth <jay.vasanth@microchip.com>