KernelSettingsTest: delete SELinux enforcing test

This is a duplicate of a host-side test, so can safely be deleted.

This file cannot be read anymore as of system/sepolicy commit
14e2e9261fec015ab6fa66f2bc67439f13c45b8d

Bug: 27756382
Test: CTS compiles.
Change-Id: I5bcfe2c0f3a72e2d76fb9122747cf3192387d69d
diff --git a/tests/tests/security/src/android/security/cts/KernelSettingsTest.java b/tests/tests/security/src/android/security/cts/KernelSettingsTest.java
index 1ab63d8..4d30a58 100644
--- a/tests/tests/security/src/android/security/cts/KernelSettingsTest.java
+++ b/tests/tests/security/src/android/security/cts/KernelSettingsTest.java
@@ -35,17 +35,6 @@
     }
 
     /**
-     * Ensure that SELinux is in enforcing mode.
-     */
-    public void testSELinuxEnforcing() throws IOException {
-        try {
-            assertEquals("1", getFile("/sys/fs/selinux/enforce"));
-        } catch (FileNotFoundException e) {
-            fail("SELinux is not compiled into this kernel, or is disabled.");
-        }
-    }
-
-    /**
      * Protect against kernel based NULL pointer attacks by enforcing a
      * minimum (and maximum!) value of mmap_min_addr.
      *