fix(sleep): Keep HIRC turned on when switching back to HIRC96

epicardium/drivers/sleep.c

@@ -195,6 +195,8 @@ void sleep_deepsleep(void)
 		BbDrvDisable();
 	}
 	turnOffClocks();
+
+	SYS_ClockSourceEnable(SYS_CLOCK_HIRC);
 	old_clkcn = MXC_GCR->clkcn;
 	switchToHIRC();
 	deepsleep();