NFC: change reset and read flow

Change reset flow using the power ioctl function. Rename the
dis-gpio pin to en-gpio in order to describe the funtionality.
Also change the read flow. No need for multiple i2c reads.

Change-Id: Ide2b5dafe8cad643c018aef3200590cb0d5ba97b
Acked-by: Afroditi Ilioudi <ailioudi@qti.qualcomm.com>
Signed-off-by: Puneet Mishra <puneetm@codeaurora.org>