Start using new C++ Fstab class widely

Bug: 62292478
Test: boot
Test: adb-remount-test.sh

Change-Id: Id4715af4c1f03e2cfc67de92d3ea58e933685e51
diff --git a/libcutils/partition_utils.cpp b/libcutils/partition_utils.cpp
index 2211ff6..b840559 100644
--- a/libcutils/partition_utils.cpp
+++ b/libcutils/partition_utils.cpp
@@ -39,8 +39,7 @@
     return ret;
 }
 
-int partition_wiped(char *source)
-{
+int partition_wiped(const char* source) {
     uint8_t buf[4096];
     int fd, ret;
 
@@ -67,4 +66,3 @@
 
     return 0;
 }
-