Revert "isNxpConfigModified() is only used for debug purpose, removing it."

This reverts commit 80b1177ac7782c2870d16a32795761d89b4884f2.

NXP_CORE_CONF_EXTN should be updated even if there isn't a firmware
upgrade.

Bug: 65582747
Test: Modify libnfc-nxp.conf
Change-Id: If0b96b08dbbbb1fa1c5e1df1b9b920e0003a8bfa
1 file changed