Remove default GSI libnfc-nci.conf

libnfc-nci.so provides a default config at /system/etc/libnfc-nci.conf.
Remove /system/etc/libnfc-nci.conf PRODUCT_COPY_FILES entries from
aosp_product.mk and board/generic/device.mk.

Bug: 157704723
Test: Build gsi. /system/etc/libnfc-nci.conf is installed.
Test: Flash gsi. Check logcat and NFC still works.
Test: Toggle NFC on/off and /etc/libnfc-nci.conf is loaded.
Test: Build aosp_bonito. Both /(system|product)/etc/libnfc-nci.conf are
  installed.
Test: Flash aosp_bonito. Check logcat and NFC still works.
Test: Toggle NFC on/off and /product/etc/libnfc-nci.conf is loaded.
Change-Id: Id119a88a10b549e1fd475cf9b14b18410923011b