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.

CRs-Fixed: 2259239
Change-Id: I4cef709856133943a2ec3e9a56bcfb55704a129f
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>