soc: qcom: initialize glink link state

Initialize glink link state to GLINK_LINK_STATE_DOWN to
return error if userspace sends glink command packet
before glink link is up.

Change-Id: I79b5e4eb5a743dd0b118ba1b28523bfea24044d7
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>