drivers: serial: Add Altera shim driver for JTAG UART soft IP

Delete the native UART JTAG driver as we will be reusing
the Altera's HAL driver.

Add the shim driver support for Altera HAL's JTAG UART soft IP.

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>