Set minimal AVC encoder level to AVCLevel1

There is a CTS test asking for a AVCLevel1 encoder. Lower the minimal
level to AVCLevel1 in low resolution so that it can pass the test.

BUG: 37101765

Test: run cts -m CtsMediaTestCases -t
android.media.cts.MediaRecorderTest#testProfileAvcBaselineLevel1

Change-Id: Id04d3389be8d6761c6d2040a7bea54a2753a7ee7
(cherry picked from commit 085bdc87edeb5304d9dc604a4d3aa4de67cb6009)
diff --git a/media/libstagefright/codecs/avcenc/SoftAVCEnc.cpp b/media/libstagefright/codecs/avcenc/SoftAVCEnc.cpp
index ce7efba..358c743 100644
--- a/media/libstagefright/codecs/avcenc/SoftAVCEnc.cpp
+++ b/media/libstagefright/codecs/avcenc/SoftAVCEnc.cpp
@@ -606,8 +606,10 @@
         level = 30;
     } else if (displaySizeY > (352 * 288)) {
         level = 21;
-    } else {
+    } else if (displaySizeY > (176 * 144)) {
         level = 20;
+    } else {
+        level = 10;
     }
     mAVCEncLevel = MAX(level, mAVCEncLevel);