exynos: use Strings8/16 c_str()

.string() doesn't work in QPR2.
Don't replace variable name ctrl.string.
grep -rli "\.string" * | xargs -i@ sed -i 's/\.string/\.c_str/g' @

Change-Id: I4c4921534c54948d68ebee93f0b3f387814b4ee5
27 files changed