data-kernel: rmnet: shs: Fix Errors Reported during Static Analysis.

Set the weights to be used in calculating "avg_pps", when the flow is
executing on the Perf CPU's in function "rmnet_shs_wq_get_flow_avg_pps".

Change-Id: Ia50db34a348c068a9b1bf3171fced858ce0a62de
Signed-off-by: Chinmay Agarwal <chinagar@codeaurora.org>