firmware: get rid of unused "xxx_sleep()" storage driver function
storage_sleepnow() is the one that is actually implemented
by storage drivers. storage_sleep() sends a Q_STORAGE_SLEEP
event to the storage thread, which will normally end up
calling the driver's sleepnow() function.
Change-Id: Ib6523073348431dcc75c0f10ef99060c6960efd8
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