soc: qcom: glink: Add locks to protect glink debugfs entries

Locks are added to protect the glink root debugfs entry list and per-
channel debugfs entries

Change-Id: I2bff157e78f0349149d5581af7cf0ec2021bcc24
Signed-off-by: Atish Kumar Patra <apatra@codeaurora.org>
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>