qc_rndis: Set default RNDIS packet alignment factor as 4

Currently default RNDIS packet alignment factor is 2 (i.e. 4 bytes).
Due to IPA hardware bug, it is required to set this as 4 (i.e. 16 bytes)
as suggested one of software workaround. This change is required when
RNDIS BAM2BAM and UL aggregation support is being enabled/used. Currently
RNDIS UL BAM2BAM and aggregation support is disable. This change is made
to make sure software workaround is being placed in code.

Change-Id: I6d1fb46fd748ce4544be2fb0a3075aef34afbabc
CRs-Fixed: 565156
Signed-off-by: Mayank Rana <mrana@codeaurora.org>