net: qualcomm: rmnet: Disable UL aggregation by default

UL aggregation was enabled by default incorrectly. Most devices
may not support UL aggregation so disable this.

CRs-Fixed: 2226308
Change-Id: I87e346dea4372100f8e58353d1cac810f37617f8
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>