drivers: regulator_nxp_vref: Clear UTRIM on init

Reset value of this register is supposed to be 0 but I noticed on some
chip, it was not resetting to 0 on system reset, don't know why, but
this supposedly redundant clear is fine for now.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>

drivers/regulator/regulator_nxp_vref.c

@@ -199,6 +199,9 @@ static int regulator_nxp_vref_init(const struct device *dev)
 		base->CSR |= VREF_CSR_ICOMPEN_MASK;
 	}
 
+	/* Workaround some chips not resetting the value correctly on reset */
+	base->UTRIM = 0;
+
 	return regulator_common_init(dev, false);
 }