Add chrdev and name query support for GLINK

Add support for the GLINK rpmsg transport to register a rpmsg chrdev. This will create the rpmsg_ctrl nodes for userspace clients to open rpmsg epts. Create a label property that will help userspace clients distinguish between the different GLINK links. The rpmsg chrdev allocation is done by allocating a local channel which also allocates an ept. We need to add some guards against edge cases for this chrdev because it will never fully open.

Changes since v2:
- Revert change to make glink attribute table const

Changes since v1:
- Add explanation to dt-bindings commit message
- Add patch complete_all the open_req/ack variables
- Add patch to prevent null pointer dereference in chrdev channel release
- Change chrdev allocation to use glink channel allocation
- Change glink attr struct to const

Chris Lew (6):
dt-bindings: soc: qcom: Add label for GLINK bindings
rpmsg: glink: Store edge name for glink device
rpmsg: glink: Use complete_all for open states
rpmsg: Guard against null endpoint ops in destroy
rpmsg: glink: Add support for rpmsg glink chrdev
rpmsg: glink: Expose rpmsg name attr for glink

 .../devicetree/bindings/soc/qcom/qcom,glink.txt    |  5 ++
 drivers/rpmsg/qcom_glink_native.c                  | 68 +++++++++++++++++++++-
 drivers/rpmsg/rpmsg_core.c                         |  2 +-
 3 files changed, 71 insertions(+), 4 deletions(-)

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