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 <[email protected]>
Cc: Grygorii Strashko <[email protected]>
Cc: Keerthy <[email protected]>
Cc: Peter Ujfalusi <[email protected]>
Cc: Russell King <[email protected]>
Cc: Tero Kristo <[email protected]>
Reported-by: Grygorii Strashko <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>

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