drivers: mipi_dbi: add SPI based MIPI DBI mode C driver

SPI controllers can easily implement MIPI DBI mode C, with the help of
GPIO pins for the reset and command/data signals. Introduce a MIPI DBI
compliant SPI driver, which emulates MIPI DBI mode C (SPI 3 and 4 wire).

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