wlan: Replace init work related functions with wrapper APIs.

Proprietary driver can not access INIT_WORK and
INIT_DELAYED_WORK kernel APIs.
To mitigate issue replace above init work related functions
with vos wrapper APIs.

CRs-Fixed: 847627
Change-Id: Ic3b9a0e3d2057b0e1e8e9b4d0fba2f3cdb1fef9a
diff --git a/CORE/HDD/src/wlan_hdd_wmm.c b/CORE/HDD/src/wlan_hdd_wmm.c
index 395ff72..ae09c42 100644
--- a/CORE/HDD/src/wlan_hdd_wmm.c
+++ b/CORE/HDD/src/wlan_hdd_wmm.c
@@ -2366,7 +2366,7 @@
    pQosContext->qosFlowId = 0;
    pQosContext->handle = HDD_WMM_HANDLE_IMPLICIT;
    pQosContext->magic = HDD_WMM_CTX_MAGIC;
-   INIT_WORK(&pQosContext->wmmAcSetupImplicitQos,
+   vos_init_work(&pQosContext->wmmAcSetupImplicitQos,
              hdd_wmm_do_implicit_qos);
 
    VOS_TRACE(VOS_MODULE_ID_HDD, WMM_TRACE_LEVEL_INFO,