Do not preallocate memory in default constructor of Sparse.*Array

By heapdump examination this saves not-an-insignificant amount of
memory and significant amount of allocations.
Similar change was also introduced for ArrayList & HashMap
implementation in JDK8.

More details in go/if-xr-android-util-collections-lazy-init.

Bug: 272467748
Test: Verified system server heapdump
Change-Id: I849dbaa46e79eae0b61b93a7ab1f5d5ef8bfbf7f

core/java/android/util/SparseArray.java

@@ -71,7 +71,7 @@ public class SparseArray<E> implements Cloneable {
      * Creates a new SparseArray containing no mappings.
      */
     public SparseArray() {
-        this(10);
+        this(0);
     }
 
     /**

core/java/android/util/SparseBooleanArray.java

@@ -51,7 +51,7 @@ public class SparseBooleanArray implements Cloneable {
      * Creates a new SparseBooleanArray containing no mappings.
      */
     public SparseBooleanArray() {
-        this(10);
+        this(0);
     }
 
     /**

core/java/android/util/SparseDoubleArray.java

@@ -50,7 +50,7 @@ public class SparseDoubleArray implements Cloneable {
 
     /** Creates a new SparseDoubleArray containing no mappings. */
     public SparseDoubleArray() {
-        this(10);
+        this(0);
     }
 
     /**

core/java/android/util/SparseIntArray.java

@@ -58,7 +58,7 @@ public class SparseIntArray implements Cloneable {
      * Creates a new SparseIntArray containing no mappings.
      */
     public SparseIntArray() {
-        this(10);
+        this(0);
     }
 
     /**

core/java/android/util/SparseLongArray.java

@@ -51,7 +51,7 @@ public class SparseLongArray implements Cloneable {
      * Creates a new SparseLongArray containing no mappings.
      */
     public SparseLongArray() {
-        this(10);
+        this(0);
     }
 
     /**