Rename FIRST_SDK_INT to DEVICE_INITIAL_SDK_INT

As API review feedback, rename Build#VERSION#FIRST_SDK_INT to
Build#VERSION#DEVICE_INITIAL_SDK_INT. As well as update all usage
in frameworks and tests.

Bug: 184735771
Test: m
Change-Id: I72660959cb4e638a8e80fcf2f4e96ea172969f44

core/java/android/net/IpSecAlgorithm.java

@@ -354,7 +354,7 @@ public final class IpSecAlgorithm implements Parcelable {
         }
 
         for (Entry<String, Integer> entry : ALGO_TO_REQUIRED_FIRST_SDK.entrySet()) {
-            if (Build.VERSION.FIRST_SDK_INT >= entry.getValue()) {
+            if (Build.VERSION.DEVICE_INITIAL_SDK_INT >= entry.getValue()) {
                 enabledAlgos.add(entry.getKey());
             }
         }