video: stm32_dcmipp: fix parallel interface RGB565 handling

On parallel interface, the DCMIPP is expecting data in what
corresponds to the RGB565_BE formats, aka

	     D7 D6 D5 D4 D3 D2 D1 D0
	     -----------------------
cycle 1:     R4 R3 R2 R1 R0 G5 G4 G3
cycle 2:     G2 G1 G0 B4 B3 B2 B1 B0

The Zephyr RGB565 video format corresponds to the RGB565_LE
hence perform a SWAPCYCLE when RGB565 is used as input format
on parallel interface.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
1 file changed