defconfig: sm8150: Disable data flow control and power save

Both features are disabled since they are currently in experimental
phase only and need to be reworked.

CRs-Fixed: 2254860
Change-Id: Ia70d2a03b57d2fb7bd0c0005d161314d98f73502
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>