Annotate rild with socket_between_core_and_vendor_violators

Full treble targets cannot have sockets between framework and vendor
processes. In theory, this should not affect aosp_arm64_ab where only
framework binaries are built. However, /system/sepolicy has rild.te
which is now vendor binary and this causes neverallow conflict when
building aosp_arm64_ab.

So, we just temporarily annotate the rild with
socket_between_core_and_vendor_violators so that the neverallow conflict
can be avoided.

Test: choosecombo 1 aosp_arm64_ab userdebug; m -j 80 The build should
not break.

Change-Id: I260757cde96857cc3f539d5f82ca69c50653f8c7