phy: freescale: add Samsung HDMI PHY

phy: freescale: add Samsung HDMI PHY

This adds the driver for the Samsung HDMI PHY found on the
i.MX8MP SoC. Based on downstream implementation from
Sandor Yu <Sandor.yu@nxp.com>.  According to the TRM, the PHY
receives parallel data from the link and serializes it.  It
also sets the PLL clock needed for the TX serializer.

Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Richard Leitner <richard.leitner@skidata.com>
Co-developed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de> # Kontron BL
Signed-off-by: Adam Ford <aford173@gmail.com>
Tested-by: Marek Vasut <marex@denx.de>
Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Tommaso Merciai <tomm.merciai@gmail.com>
Link: https://lore.kernel.org/r/20240227220444.77566-3-aford173@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>