pmdomain: imx: gpcv2: use proper helper for property detection

Starting with commit c141ecc3 ("of: Warn when of_property_read_bool()
is used on non-boolean properties"), probing the gpcv2 device on i.MX8M
SoCs leads to warnings when LOCKDEP is enabled.

Fix this by checking property presence with of_property_present as
intended.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.kernel.org/r/20250218-gpcv2-of-property-present-v1-1-3bb1a9789654@pengutronix.de


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>