clean up GTA02 WLAN power control

This patch cleans up the GTA02 WLAN power control platform device:

- remove misleading /sys/devices/platform/gta02-pm-wlan.0/power_on
  Users really wishing to play with reset can just  gpio j12=0

- rename gta02_wlan_power to gta02_wlan_reset, because that's what it
  truly is

- remove handling of GTA02_CHIP_PWD because
  - it's not used, say our schematics
  - even if it is, it's sampled long before we could affect it

- move SDIO-specific conversion from "power switch" to "reset
  button" logic from gta02_wlan_reset to gta02_s3c_mmc_set_power

- removed mutex protection because we now only have a single user

A note in passing: we can probably do away with gta02_pm_wlan
completely once upstream rfkill adds better support for type-based
control.

Signed-off-by: Werner Almesberger <werner@openmoko.org>

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