ARM: OMAP: Fix GPIO switch initial output state handling

ARM: OMAP: Fix GPIO switch initial output state handling

The switchover to cross-platform GPIO interface unexpectedly caused all
output GPIO switches to be set to high state by default, unlike the
original OMAP code. Introduce a new GPIO switch flag to define the
initial state of the switch. Unless the flag is set, the default is now
inactive state of the switch.

Also store the state of output switches directly into the switch struct
instead of trying to read an output GPIO.

Signed-off-by: Jani Nikula <ext-jani.1.nikula@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>