Create LocaleList and HashSet lazily to save OS boot time

Creating HashSet and LocaleList in Zygote make performance impact
to the boot time. Since this API is not called so frequently and less
application is expected to call this API. So let's make Set and
LocaleList only when it is requested.

Here is a result of boot time perf test:
Before: TOTAL_BOOT_TIME : 16229.5
After : TOTAL_BOOT_TIME : 11704.0

Bug: 114774424
Test: atest android.graphics.fonts
Test: atest TypefaceSystemFallbackTest
Change-Id: I07247a78f6091c8adfaac748fe4a77a4597b1ae2