MLK-16347-11: clk: imx: imx8qxp: Add missing MIPI DSI clocks

MLK-16347-11: clk: imx: imx8qxp: Add missing MIPI DSI clocks

Add missing clocks for MIPI-DSI SS: RX_ESC and TX_ESC
Also added the posibility to select clock parents for MIPI-DSI versus
LVDS.
The SCFW was changed, so now the LVDS pixel and phy clocks need to
specify their parrents.
Also, the TX_ESC and RX_ESC clocks from MIPI-DSI need to specify their
parrents in DTS files.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
Signed-off-by: Oliver Brown <oliver.brown@nxp.com>