defconfig: Disable CONFIGFS_RNDIS on all targets

On targets that supports GSI, disable f_rndis driver to
prevent the un-necessary bind of this function when userspace
rules links the rndis.gs4 for rndis function.
Also, this will prevent the net daemon trying to bring up
the usb0 registered by the f_rndis driver, which will cause
no-IP failure on host PC.

Change-Id: Id97b7de253b11f04a5778f198ad3d3f081bc237d
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>