drivers: sensor: mcux_acmp: fix expansion-to-defined warning

Rework the checks for INPSEL, INNSEL, and C0_OFFSET_BIT presence to
avoid warnings when -Wexpansion-to-defined is enabled.

The warning was enabled in c7bc6380.

Fixes #32475.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>