fs_mgr: Make kDefaultAndroidDtDir constexpr
Change its type from std::string to constexpr char[] so that it does
not need to be constructed at runtime, which pollutes the bss page
unnecessarily.
Bug: 138856262
Test: Along with another fix for libbootloader_message.so, see that bss
section for libbootloader_message.so is now clean on cuttlefish
for several processes.
Change-Id: I1c8ff9cfeb25164a352cef89cfa7be889b3d3387
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index 9a0f4fe..bc197cd 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -46,7 +46,7 @@
namespace fs_mgr {
namespace {
-const std::string kDefaultAndroidDtDir("/proc/device-tree/firmware/android");
+constexpr char kDefaultAndroidDtDir[] = "/proc/device-tree/firmware/android";
struct FlagList {
const char *name;