[Utils] btn_wait_timeout

- Allow btn_wait_timeout to be triggered immediately
- Make power options global

bootloader/utils/util.h

@@ -34,6 +34,10 @@ u32 get_tmr_ms();
 u32 get_tmr_s();
 void usleep(u32 ticks);
 void msleep(u32 milliseconds);
+void panic(u32 val);
+void reboot_normal();
+void reboot_rcm();
+void power_off();
 void exec_cfg(u32 *base, const cfg_op_t *ops, u32 num_ops);
 u32 crc32c(const void *buf, u32 len);