ARM: dts: imx53: Add GE Healthcare PPD

PPD is a product from GE Healthcare to monitor vital biometric signals.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.co.uk>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>