Fix denial for ioctl FS Verity

For unknown reason, denial still happens with system app after applying
ag/20712480. This commit adds a work around to fix this.

Bug: 258093107
Fixes: 272530397

Test: flash build, pair watch with phone, check SE denials log
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:0ade3b2183d850fd508569782e35a59ef2bd4dce)
Merged-In: I16932c793c5ca144746d0903ed1826c1847d2add

Change-Id: I16932c793c5ca144746d0903ed1826c1847d2add
diff --git a/private/system_server.te b/private/system_server.te
index 7fea6e7..0306598 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -1107,6 +1107,7 @@
 
 # Allow system process to measure fs-verity for apps, apps being installed and system files
 allowxperm system_server { apk_data_file apk_tmp_file system_file }:file ioctl FS_IOC_MEASURE_VERITY;
+allow system_server system_file:file ioctl;
 
 # Postinstall
 #