app: remove logspam on ion ioctls

Apps definitely need access to ion ioctls. Remove audit statement.

Test: build marlin
Bug: 35715385
Change-Id: I777d3e9a88065a5f711315a7da6d63587744b408

private/app.te

@@ -249,8 +249,6 @@ allowxperm { appdomain -bluetooth } self:{ rawip_socket tcp_socket udp_socket }
 allow { appdomain -isolated_app } ion_device:chr_file rw_file_perms;
 # TODO is write really necessary ?
 auditallow { appdomain userdebug_or_eng(`-su') } ion_device:chr_file { write append };
-# TODO audit ion ioctl usage by apps
-auditallow { appdomain userdebug_or_eng(`-su') } ion_device:chr_file ioctl;
 
 allow { appdomain -isolated_app } hal_graphics_allocator:fd use;