FP4: Allow vendor_init to set vendor_ssr_prop

[   19.136889] selinux: avc:  denied  { set } for  scontext=u:r:vendor_init:s0 tcontext=u:object_r:vendor_ssr_prop:s0 tclass=property_service permissive=0\x0a
[   19.154124] init: Do not have permissions to set 'persist.vendor.sys.ssr.enable_ramdumps' to '1' in property file '/vendor/build.prop': SELinux permission check failed
[   19.170388] selinux: avc:  denied  { set } for  scontext=u:r:vendor_init:s0 tcontext=u:object_r:vendor_ssr_prop:s0 tclass=property_service permissive=0\x0a
[   19.187645] init: Do not have permissions to set 'persist.vendor.sys.ssr.restart_level' to 'modem,adsp,slpi' in property file '/vendor/build.prop': SELinux permission check failed

Bug: 143504506
Test: flash selinux modules to device and find avc errors gone
Change-Id: I8430370b038bcbdfdc8935f125c415a07fc35f7e