ata: Heavily rework sleep and poweroff logic

 * Use of ata_disk_can_poweroff() was inverted, resulting in SATA SSDs
   getting powered off but leaving _everything_ else on, including spinning
   rust!
 * Replace the can_poweroff() heuristic with a test for the mandatory
   ATA power mgmt feature flag. Notably, the CF->SD adapters don't claim
   to support this!
 * Eliminate duplicated tests in sleep code
 * Wrap all poweroff-related code with HAVE_ATA_POWER_OFF
 * Don't ever use SLEEP command, only STANDBY_IMMEDIATE
 * Gate call to STANDBY_IMMEDIATE behind a can_poweroff() test
 * Prefer FLUSH_CACHE_EXT to FLUSH_CACHE where available.
 * Improve SSD detection heuristics to any of these:
   * Explicltly identifies as SSD (covers newer CF and SATA)
   * TRIM support
   * CFA compliant AND (CF level 0 OR high speed support)
 * Report SSD detection in debug menu

Change-Id: I7fcb83b6d6eabddc11c64326a573b08ab85412b5

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