system_server: grant read access to vendor/framework

avc: denied { getattr } for path="/vendor/framework"
scontext=u:r:system_server:s0 tcontext=u:object_r:vendor_framework_file:s0
tclass=dir

Bug: 68826235
Test: boot Taimen, verify denials no longer occur.
Change-Id: Id4b311fd423342c8d6399c3b724417aff9d1cd88