Do not run unnecessary or incompatible rtc tests on Android.

--- a/tools/testing/selftests/rtc/rtctest.c
+++ b/tools/testing/selftests/rtc/rtctest.c
@@ -49,6 +49,7 @@
 	       rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
 }
 
+#ifndef __ANDROID__ // b/31578457
 TEST_F_TIMEOUT(rtc, uie_read, NUM_UIE + 2) {
 	int i, rc, irq = 0;
 	unsigned long data;
@@ -312,6 +313,7 @@
 	new = timegm((struct tm *)&tm);
 	ASSERT_EQ(new, secs);
 }
+#endif
 
 static void __attribute__((constructor))
 __constructor_order_last(void)