[Bug] Change the sepolicy name for exo_camera_injection

- Change the sepolicy name from platfrom_app to exo_app.
- Selinux avc log:
E/SELinux: avc:  denied  { find } for interface=vendor.google.exo_camera_injection::IExoCameraInjection sid=u:r:exo_app:s0:c248,c256,c512,c768 pid=11479 scontext=u:r:exo_app:s0:c248,c256,c512,c768 tcontext=u:object_r:hal_exo_camera_injection_hwservice:s0 tclass=hwservice_manager permissive=0

Bug: 184736718
Test: Verified exo_camera_injection provider service use cases function as expected; no denials.
Change-Id: I08887b8b6020cb7b3fb3da77cea9a1f453655bea
diff --git a/whitechapel/vendor/google/exo_camera_injection/exo_app.te b/whitechapel/vendor/google/exo_camera_injection/exo_app.te
new file mode 100644
index 0000000..a90de48
--- /dev/null
+++ b/whitechapel/vendor/google/exo_camera_injection/exo_app.te
@@ -0,0 +1,3 @@
+# Allow exo app to find and bind exo camera injection hal.
+allow exo_app hal_exo_camera_injection_hwservice:hwservice_manager find;
+binder_call(exo_app, hal_exo_camera_injection)
diff --git a/whitechapel/vendor/google/exo_camera_injection/platform_app.te b/whitechapel/vendor/google/exo_camera_injection/platform_app.te
deleted file mode 100644
index b4dee87..0000000
--- a/whitechapel/vendor/google/exo_camera_injection/platform_app.te
+++ /dev/null
@@ -1,3 +0,0 @@
-# Allow exo app to find and bind exo camera injection hal.
-allow platform_app hal_exo_camera_injection_hwservice:hwservice_manager find;
-binder_call(platform_app, hal_exo_camera_injection)