defconfig: Enabled RmNet Data on all platforms which require it

Enabled RmNet data on APQ8084, MSM8974, and MDMKrypton in order to
support MAP data feature as required for data connectivity on these
platforms.

CRs-Fixed: 525675
Change-Id: If93a7a716acdb1a1621ecbdea71c1363d2e01731
Signed-off-by: Harout Hedeshian <harouth@codeaurora.org>