strago: Enable LTO to save flash space.
strago's flash is going to running out.
This CL enable LTO to save spaces.
TEST=make buildall
BRANCH=none
#define CONFIG_POWER_COMMON
#define CONFIG_POWER_SHUTDOWN_PAUSE_IN_S5
#define CONFIG_EXTPOWER_GPIO
+#define CONFIG_LTO
/* All data won't fit in data RAM. So, moving boundary slightly. */
#undef CONFIG_RO_SIZE
