sepolicy: Isolate qcom sysfs_graphics policy for recovery

 * The sysfs_graphics context is not defined globally
    but only by qcom common sepolicies

 * Introduced by commit:
    sepolicy: Initial policy for recovery
    Change-Id: Iac57b472dd4628b9bd27fbe47fbbb35c09743be2
    Date: Sat, 17 Feb 2018 01:17:34 +0100
    From: Tom Marshall <tdm.code@gmail.com>

Change-Id: If518dbd224f6993ecf06394cfe2bca022e1649fb