mfd: cros_ec: Delay for 50ms when we see EC_CMD_REBOOT_EC

If someone sends a EC_CMD_REBOOT_EC to the EC, the EC will likely be
unresponsive for quite a while.  Add a delay to the end of the command
to prevent random failures of future commands.

NOTES:
* This could be optimized a bit by simply delaying the next command
  sent, but EC_CMD_REBOOT_EC is such a rare command that the extra
  complexity doesn't seem worth it.
* This is a bit of an "ugly hack" since the SPI driver is effectively
  snooping on the communication and making a lot of assumptions.  It
  would be nice to architect in some better solution long term.
* This same logic probably needs to be applied to the i2c driver.

Signed-off-by: Doug Anderson <[email protected]>
Reviewed-by: Randall Spangler <[email protected]>
Reviewed-by: Vadim Bendebury <[email protected]>
Signed-off-by: Javier Martinez Canillas <[email protected]>
Signed-off-by: Lee Jones <[email protected]>

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