Small fixes and changes

- Allow printing of more log on HOS boot when LOGS are OFF.
- A small name refactoring
- Add battery warning symbol when battery < 3200mV

bootloader/mem/sdram.c

@@ -696,7 +696,6 @@ sdram_params_t *sdram_get_params_patched()
 
 void sdram_init()
 {
-	//TODO: sdram_id should be in [0,4].
 	const sdram_params_t *params = (const sdram_params_t *)sdram_get_params();
 
 	// Set DRAM voltage.