drivers: uart_altera_jtag_hal: use DEVICE_DT_INST_DEFINE()

The conversion to devicetree seems to be half lost
for this driver. There are already bindings and nodes for
compatible "altr,jtag-uart", update driver to use it.
Remove last mention of CONFIG_UART_CONSOLE_ON_DEV_NAME.

Resolves #37207

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>