soc: qcom: glink_smd_xprt: Resume RX operation during intent re-use

G-Link SMD Transitional XPRT resumes RX operation only when a receive
intent is queued. This leads to a communication stall if the receive
intents get re-used and is not queued.

Resume the RX operation in G-Link SMD Transitional XPRT if a receive intent
is re-used. Also access the intent_req flag exclusively to avoid any race
condition.

CRs-Fixed: 938394
Change-Id: I5a1fdc7ee35070a42659c8e701d73ee2de8d6d05
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>