Use String8/16 c_str [idmap2, androidfw]

Bug: 295394788
Test: make checkbuild
Change-Id: I95264e8bfc96a5adb7f7cc55a24dc0e8c126371d
(cherry picked from commit a550a478f7f5d650b04cd30798fb9a28d95ed79c)
3 files changed