NFC: trf7970a: Don't de-assert EN2 unless it was asserted

When the trf7970a part has the bug related to 'en2-rf-quirk',
the GPIO connected to the EN2 pin will not be asserted by the
driver when powering up so it shouldn't be de-asserted when
powering down.
Signed-off-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/trf7970a.c

@@ -1940,6 +1940,8 @@ static int trf7970a_power_down(struct trf7970a *trf)
 	}
 
 	gpio_set_value(trf->en_gpio, 0);
+
+	if (!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW))
 		if (gpio_is_valid(trf->en2_gpio))
 			gpio_set_value(trf->en2_gpio, 0);