Bug 1093401 - Only set MOZ_DATA_REPORTING in configure. r=rnewman

For all applications, MOZ_DATA_REPORTING is set in configure if any of
MOZ_TELEMETRY_REPORTING, MOZ_SERVICES_HEALTHREPORT, or MOZ_CRASHREPORTER
is set.  For mobile/android, we *also* set MOZ_DATA_REPORTING when we're
not in a release (Beta/Release) build.

Geo/stumbler data is build-time enabled by MOZ_ANDROID_MLS_STUMBLER but
does not automatically upload data: the user must manually enable
uploading geo/stumbler data.  That is, this is an explicit opt-in rather
than an explicit opt-out; and geo/stumbler data should not be covered by
the data reporting notification at this time.

In the past, I believe that geo/stumbler data was uploaded based on the
feature being build time enabled, which corresponded to !RELEASE_BUILD,
so the logic being removed was reasonable.