soc: qcom: ipc_router_glink_xprt: Fix intent request callback

G-Link driver notifies IPC Router about intent request events in atomic
context. IPC router is allocating from with GFP_KERNEL.

Allocate the memory from atomic pool with GFP_ATOMIC.

CRs-Fixed: 978562
Change-Id: I75a38a2765e06aa490f91a79e5fd5c83f3c12c23
Signed-off-by: Dhoat Harpal <hdhoat@codeaurora.org>