Revert "Add coex permissions to Shell for CTS tests"

This reverts commit 9f956ccf413a2ea2cce3c29503e5c858798e67b2.

Reason for revert: b/175198007

Change-Id: Ie35dca0500734ff35781c7344dcc70953f29d174
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index 84f44c0..0fdb282 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -337,10 +337,6 @@
     <!-- Permission needed for CTS test - CtsHdmiCecHostTestCases -->
     <uses-permission android:name="android.permission.HDMI_CEC" />
 
-    <!-- Permission needed for CTS test - WifiManagerTest -->
-    <uses-permission android:name="android.permission.WIFI_ACCESS_COEX_UNSAFE_CHANNELS" />
-    <uses-permission android:name="android.permission.WIFI_UPDATE_COEX_UNSAFE_CHANNELS" />
-
     <application android:label="@string/app_label"
                 android:theme="@android:style/Theme.DeviceDefault.DayNight"
                 android:defaultToDeviceProtectedStorage="true"