Do not throw SIGABORT on shutdown or HAL crash

The SIGABORT stack dump confuses APC into thinking there is
a crash in the nfc service.

Bug: 195455309
Test: reboot, nfc on/off, tag read
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:d6c829f55d677184d55bd3b7bc559c2fef4a24a6)
Merged-In: I924ea426a67a3ae781207c958ba305b543ed4ded
Change-Id: I924ea426a67a3ae781207c958ba305b543ed4ded

src/adaptation/NfcAdaptation.cc

diff --git a/src/adaptation/NfcAdaptation.cc b/src/adaptation/NfcAdaptation.cc
index d805fb0..711ae00 100644
--- a/src/adaptation/NfcAdaptation.cc
+++ b/src/adaptation/NfcAdaptation.cc
@@ -191,7 +191,7 @@
       mNfcDeathHal->unlinkToDeath(this);
     }
     mNfcDeathHal = NULL;
-    abort();
+    exit(0);
   }
   void finalize() {
     if (mNfcDeathHal) {
@@ -1065,7 +1065,7 @@
                            this);
     mAidlHal = nullptr;
   }
-  abort();
+  exit(0);
 }
 
 // static