defconfig: Disable rmnet_data driver

Since all map packet processing is handled by upstream rmnet driver,
rmnet_data driver can be safely turned off.

CRs-Fixed: 2277753
Change-Id: I68ac1f9c957f699d332eaf75d3c402516f9e7e9d
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>