init: use std::vector<std::string> for argument passing

Change-Id: Ie7a64e65de3a20d0c7f7d8efc0f7c1ba121d07fe
diff --git a/init/bootchart.cpp b/init/bootchart.cpp
index e5b153a..efaee1c 100644
--- a/init/bootchart.cpp
+++ b/init/bootchart.cpp
@@ -203,7 +203,7 @@
     return count;
 }
 
-int do_bootchart_init(int nargs, char** args) {
+int do_bootchart_init(const std::vector<std::string>& args) {
     g_remaining_samples = bootchart_init();
     if (g_remaining_samples < 0) {
         ERROR("Bootcharting init failure: %s\n", strerror(errno));