sepolicy: Optionally build sepolicy_freeze_test

 * Disable sepolicy_freeze_test unless the variable
    PLATFORM_SEPOLICY_VERSION_TEST is set to true

 * Needed to modify public sepolicy rules, example:
    "Files system/sepolicy/prebuilts/api/28.0/public/name.te
    and system/sepolicy/public/name.te differ"

Signed-off-by: Adrian DC <radian.dc@gmail.com>

Issue: FP2P-458
Change-Id: I8a333d492d0c2953ff35e81600dd7fe316f608ec
1 file changed