build: set data roaming always to false

NOTE: This is a temporary fix until the cause of the issue is found

some of our devices inherit this mk here and vendor slim does not overwrite it.
Thanks Kurre for pointing out

Change-Id: Ie2ef480add1ff1614fea1b986758ceb5330f0005
Merge "build: set data roaming always to false" into kk4.4
Merge branch 'kk4.4' of git://github.com/SlimRoms/android_build into kk4.4