drivers: mipi_dsi: dsi_mcux_2l: enable DCS_LONG_WRITE using interrupts

Fixup support for DCS_LONG_WRITE command in DSI MCUX 2L driver. Since long
DCS commands may benefit from nonblocking I/O, add support for non blocking
transfers to the DSI driver.

This commit also corrects the interrupt number for the RT595, which uses
the DSI_MCUX_2L IP block.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>