wlan: Fix for vos_lock_acquire() failing with return code -4 (i.e -EINTR).

Fixed this by using the  mutex_lock() instead of
mutex_lock_interruptible().

Change-Id: I3458eb0c255f1ac2cb4b808f4157041cdde01ff5
CR-Fixed: 396002
diff --git a/CORE/VOSS/src/vos_lock.c b/CORE/VOSS/src/vos_lock.c
index 27a97aa..5087c28 100644
--- a/CORE/VOSS/src/vos_lock.c
+++ b/CORE/VOSS/src/vos_lock.c
@@ -200,8 +200,9 @@
          return VOS_STATUS_SUCCESS;
       }
       // Acquire a Lock
-      rc = mutex_lock_interruptible( &lock->m_lock ); 
-      if (rc) 
+      mutex_lock( &lock->m_lock );
+      rc = mutex_is_locked( &lock->m_lock );
+      if (rc == 0)
       {
          VOS_TRACE(VOS_MODULE_ID_VOSS, VOS_TRACE_LEVEL_ERROR,
                 "%s: unable to lock mutex (rc = %d)", __FUNCTION__, rc);