defconfig: sm8150: Enable data flow control and power save

Enable kernel burst mode flow control and power collapse feature.
Burst mode Data Flow Control (DFC) is handled in kernel.
Flow info is added/deleted to rmnet driver if DFC is supported.
Flow is enabled if grant size is larger than 0 on flow status indication.
Flow is disabled if grant size is 0 or UL data size larger than grant size.

Change-Id: Id0dfad0b917012897238a59eed3e280e54ed6208
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>