defconfig: sm8150: Enable data flow control and power save

Data flow control and power save features depend on qmi_rmnet config

Change-Id: I4f9663518506f4b8b1c74c8b050b352627c1b015
Acked-by: Ning Cai <ncai@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>