Add adaptive haptics restricted system property

Create adaptive haptics system property to store adaptive haptics enable
state.

Bug: 198239103
Test: Verified system property usage
Change-Id: I5d4f0a5c8ec4a5b0ce18bc03a6d30879dd76d58b
Signed-off-by: Chris Paulo <chrispaulo@google.com>
diff --git a/private/system_app.te b/private/system_app.te
index 61d3b5d..3b92c0f 100644
--- a/private/system_app.te
+++ b/private/system_app.te
@@ -34,6 +34,7 @@
 allow system_app icon_file:file r_file_perms;
 
 # Write to properties
+set_prop(system_app, adaptive_haptics_prop)
 set_prop(system_app, arm64_memtag_prop)
 set_prop(system_app, bluetooth_a2dp_offload_prop)
 set_prop(system_app, bluetooth_audio_hal_prop)
@@ -192,3 +193,6 @@
 # bug reports, but not reads.
 neverallow system_app shell_data_file:dir { no_w_dir_perms open search read };
 neverallow system_app shell_data_file:file { open read ioctl lock };
+
+# system_app should be the only domain writing the adaptive haptics prop
+neverallow { domain -init -system_app } adaptive_haptics_prop:property_service set;