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Support softsleep by defining PIN_GPS_STANDBY on CDTop CD-PA1010D. This differs from existing MTK GPS e.g. L76K, where pulling PIN_GPS_STANDBY (WAKE-UP pin) low is not sufficient to put the GPS module in standby. An additional `$PMTK225,4*2F` must be sent to enter "Backup Mode", which is exited by bringing PIN_GPS_STANDBY (WAKE-UP pin) high. Refer to datasheet[0] §1.9.3 "Backup Mode". 0: https://cdn-learn.adafruit.com/assets/assets/000/084/295/original/CD_PA1010D_Datasheet_v.03.pdf Signed-off-by: Andrew Yong <me@ndoo.sg>