Revert "wl12xx_sdio: reset during op_remove_interface"

This reverts commit aaacbba531f597b35e544a0d542644c430246704.
nitrogen6x: remove wl12xx regulator

   The i.MX6 esdhc driver will keep a reference to this, preventing
   its' use in powering down the card.

   In other words, this is useless code to set a single GPIO.

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nitrogen6x: remove wl12xx .set_power callback

No other wl12xx platform seems to use this, and it's buggy in
the 3.0.35 drivers.

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nitrogen6x: export WL and BT enable pins (175 and 176)

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nitrogen6x: leave WL_EN pin high

This was previously done inside the "fixed regulator" code.

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>