Prepare switching font loading to system server.

Currently, fonts are loaded in Zygote.
This CL adds a preparation to switch it to system server and
bindApplication(), so that system server will be able to update font map
at runtime.

(1) Zygote will be initialized without fonts.
(2) System server will maintain a serialized font map in ashmem.
(3) Apps will load font map from the ashmem in bindApplication().

The change is guarded by Typeface.ENABLE_LAZY_TYPEFACE_INITIALIZATION,
and the new behavior is disabled by default.
I tested with ENABLE_LAZY_TYPEFACE_INITIALIZATION = true.

Bug: 172891184
Test: atest FrameworksCoreTests:TypefaceTest
Test: atest CtsGraphicsTestCases
Test: atest CtsTextTestCases
Test: atest CtsWidgetTestCases
Change-Id: I40832962a4b27f6160c4dc6268689c52f6a4dd33