Relax neverallows for vendor to use /system/bin/sh

Since 202404, vendor components will use /system/bin/sh for system(3),
popen(3), etc.

Bug: 324142245
Test: system("readlink /proc/$$/exe") in vendor HALs
Change-Id: I521499678e87a7d0216a276e014888867f495803
diff --git a/public/hal_neverallows.te b/public/hal_neverallows.te
index 621a0b8..6730c32 100644
--- a/public/hal_neverallows.te
+++ b/public/hal_neverallows.te
@@ -85,7 +85,13 @@
   halserverdomain
   -hal_dumpstate_server
   -hal_telephony_server
-} { file_type fs_type }:file execute_no_trans;
+} {
+  file_type
+  fs_type
+  # May invoke shell commands via /system/bin/sh
+  -shell_exec
+  -toolbox_exec
+}:file execute_no_trans;
 # Do not allow a process other than init to transition into a HAL domain.
 neverallow { domain -init } halserverdomain:process transition;
 # Only allow transitioning to a domain by running its executable. Do not