Bump the max size of the getUserData binder caches

This change increases the maximum size of selected binder caches.
This table lists the module, the API, the old cache size, and the new
cache size.  Note that the new cache size is only needed during
system boot: the steady-state cache size is much smaller.

 * IAccountManager      getUserData             4      32

Flag: EXEMPT bug_fix
Bug: 346346313
Test: Boot the phone and observe the number of caches that have
      overflowed.
Change-Id: I5b5cd4ef8f5ebba988baa518e929a3083e674659