defconfig: QCS403: Disable USB diag_bridge, QRTR and RMNET host drivers

USB diagfwd, diag_brigde, QRTR transport and RmNet data drivers
are not required for QCS403 target. Make change for the same.

Change-Id: Id14095945e52b1de7420753b455092a1f9e070f1
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>