* dsleep( us, option )
Hardware has to support deep-sleep wake up (XPD_DCDC connects to EXT_RSTB with 0R). system_deep_sleep(0) ，set no wake up timer，connect a GPIO to pin RST, the chip will wake up by a falling-edge on pin RST.
** us: Integer
time to sleep.
if us = 0, it will sleep forever.
** option: Integer
option=0, init data byte 108 is valuable;
option>0, init data byte 108 is valueless.
More details as follows:
0, RF_CAL or not after deep-sleep wake up, depends on init data byte 108.
1, RF_CAL after deep-sleep wake up, there will belarge current.
2, no RF_CAL after deep-sleep wake up, there will only be small current.
4, disable RF after deep-sleep wake up, just like modem sleep, there will be the smallest current.
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