defconfig: Enable rmnet_ctl driver

For both standard and perf based defconfig, enable
the rmnet_ctl driver for SM8150.

This enables the driver which handles QMAP based
DFC flow control commands from MHI.

Change-Id: I20d0ffe33c3019efab147a669a7721ca46da9ba4
Signed-off-by: Conner Huff <chuff@codeaurora.org>