set default shutdown timeout to 6 secs

- Test data shows that most shutdown finishes in 6 secs.
- The original 10 secs is too long wih no shutdown animation
  running in screen.

bug: 36657139
Test: check time with reboot
Change-Id: I9a805ddfde8156b066485902048d0cd01365c453

parent 8cde0906

init/reboot.cpp

+1 −2

Original line number	Diff line number	Diff line
		@@ -318,8 +318,7 @@ void DoReboot(unsigned int cmd, const std::string& reason, const std::string& re
		abort();
		}

		/* TODO update default waiting time based on usage data */
		constexpr unsigned int shutdownTimeoutDefault = 10;
		constexpr unsigned int shutdownTimeoutDefault = 6;
		unsigned int shutdownTimeout = shutdownTimeoutDefault;
		if (SHUTDOWN_ZERO_TIMEOUT) { // eng build
		shutdownTimeout = 0;