Set visibility rule for libandroidicu

Other mainline modules should not link libandroidicu.
They should use libicu available in the NDK, but URegex*
and UConverter are not available in the libicu.

libandroidicu should only be used by the platform itself.

Bug: 263852499
Test: m droid
Change-Id: I19ff248c595b3d14ae9063ee89a14170d4681704
1 file changed