Allow bootanimation to talk to hwservicemanager.

Because bootanimation uses the graphics mapper
HIDL service (which is always passthrough), it makes
a call to hwservicemanager to let it know it has
obtained a reference to it.

Bug: 35207188
Test: no more denials from bootanim
Change-Id: I99ea57a0d7777cb84eeaca26426ea38bf72ee933

public/bootanim.te

@@ -6,6 +6,8 @@ binder_use(bootanim)
 binder_call(bootanim, surfaceflinger)
 binder_call(bootanim, audioserver)
 
+hwbinder_use(bootanim)
+
 allow bootanim gpu_device:chr_file rw_file_perms;
 
 # /oem access