net: qualcomm: rmnet: Change the de-aggregation logic for coalescing

Rmnet can directly pass on the skb from the physical driver in case a
coalescing frame is received in MAPv5 format.

CRs-Fixed: 2347014
Change-Id: Ia500443e1b483d76d55c7e6ed0f9965d04e2be72
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>