dw3000: rework deep sleep according dwt driver, refs UWB-1877
Alignment with dwt driver.
Revert the loop for checking the backup because it causes
a hw race condition that stuck the chip
BUG: 199275459
BUG: 198650370
Change-Id: I50f9e6e565d55ab1a19165d925051e4444711e93
Signed-off-by:
Jean-Michel RIOT <jean-michel.riot@qorvo.com>
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