gpio: gpio-omap: limit errata 1.101 handling to wkup domain gpios only

We need to only apply errata 1.101 handling to clear non-wakeup edge gpios
for idle to the gpio bank(s) in the wkup domain to prevent spurious wake-up
events.

And we must restore what we did after idle manually as the gpio bank in
wkup domain is not restored otherwise.

Let's keep bank->saved_datain register reading separate, that's not related
to the 1.101 errata and is used separately on restore.

Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Tero Kristo <t-kristo@ti.com>
Reported-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

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