system_server: TelephonyManager reads /proc/cmdline

Bug: 124466646
Test: build
Change-Id: Ib4868826eb153543c65503bfb4d3623c4158ffae
(cherry picked from commit 29b76e2ceec2ab1e04715657a79b6544afdf09c9)
diff --git a/prebuilts/api/29.0/private/system_server.te b/prebuilts/api/29.0/private/system_server.te
index 51cbd28..73891c9 100644
--- a/prebuilts/api/29.0/private/system_server.te
+++ b/prebuilts/api/29.0/private/system_server.te
@@ -847,6 +847,7 @@
 r_dir_file(system_server, proc_net_type)
 r_dir_file(system_server, proc_qtaguid_stat)
 allow system_server {
+  proc_cmdline
   proc_loadavg
   proc_meminfo
   proc_pagetypeinfo
diff --git a/private/system_server.te b/private/system_server.te
index 51cbd28..73891c9 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -847,6 +847,7 @@
 r_dir_file(system_server, proc_net_type)
 r_dir_file(system_server, proc_qtaguid_stat)
 allow system_server {
+  proc_cmdline
   proc_loadavg
   proc_meminfo
   proc_pagetypeinfo