iio:trigger: rename try_reenable() to reenable() plus return void

As we no longer support a try again if we cannot reenable the trigger
rename the function to reflect this.   Also we don't do anything with
the value returned so stop it returning anything.  For the few drivers
that didn't already print an error message in this patch, add such
a print.

Signed-off-by: Jonathan Cameron <[email protected]>
Reviewed-by: Lars-Peter Clausen <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Acked-by: Srinivas Pandruvada <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Srinivas Pandruvada <[email protected]>
Cc: Christian Oder <[email protected]>
Cc: Eugen Hristev <[email protected]>
Cc: Nishant Malpani <[email protected]>
Cc: Daniel Baluta <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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