Bug 817939 - restart ioctl with EINTR for FMRadio. r=jlebar

hal/gonk/GonkFMRadio.cpp

@@ -189,8 +189,11 @@ runTavaruaRadio(void *)
   buffer.m.userptr = (long unsigned int)buf;
 
   while (sRadioEnabled) {
-    if (ioctl(sRadioFD, VIDIOC_DQBUF, &buffer) < 0)
+    if (ioctl(sRadioFD, VIDIOC_DQBUF, &buffer) < 0) {
+      if (errno == EINTR)
+        continue;
       break;
+    }
 
     for (unsigned int i = 0; i < buffer.bytesused; i++) {
       switch (buf[i]) {