iio: fetch and enable regulators unconditionally

This patch is inspired by a comment of Jonathan Cameron on patch of
Linus Walleij commit aeb55fff3891834e07a3144159a7298a19696af8 ("iio: st_sensors: fetch and enable regulators unconditionally").

The explanation for this change is same as in that patch:
"Supplies are *not* optional (optional means that the supply is
optional in the electrical sense, not the software sense) so we need to
get the and enable them at all times.

If the device tree or board file does not define suitable regulators for
the component, it will be substituted by a dummy regulator, or, if
regulators are disabled altogether, by stubs. There is no need to use the
IS_ERR_OR_NULL() check that is considered harmful.

Reported-by: Linus Wallerij <[email protected]>
Suggested-by: Jonathan Cameron <[email protected]>
Signed-off-by: Crt Mori <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>

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