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>
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