net: qualcomm: rmnet: Allow UL aggregation time limit of 1ms

Reduce the minimum allowed UL aggregation timeout to 1ms
as a lower limit might be preferable to reduce latency for
sporadic traffic scenarios.

CRs-fixed: 2610186
Change-Id: Iba1c02232fa83d7cac112bd4b3f625128e2da88b
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>