soc: qcom: pmic_glink: Introduce base PMIC GLINK driver

The PMIC GLINK service runs on one of the co-processors of some modern
Qualcomm platforms and implements USB-C and battery managements. It uses
a message based protocol over GLINK for communication with the OS, hence
the name.

The driver implemented provides the rpmsg device for communication and
uses auxiliary bus to spawn off individual devices in respective
subsystem. The auxiliary devices are spawned off from a
platform_device, so that the drm_bridge is available early, to allow the
DisplayPort driver to probe even before the remoteproc has spun up.

Signed-off-by: Bjorn Andersson <[email protected]>
Tested-by: Konrad Dybcio <[email protected]> # SM8350 PDX215
Reviewed-by: Neil Armstrong <[email protected]>
Tested-by: Neil Armstrong <[email protected]> # on SM8550-MTP & SM8450-HDK
Signed-off-by: Bjorn Andersson <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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