NFC: Integrate constants

Integrate constants from nfc.h, fix compile-time warning,
changed chip type, and modified device node in example
configuration files.

(Constants from nfc.h manually integrated from
file: hardware/libhardware/include/hardware/nfc.h
project: vendor/nxp/opensource/reference
branch: github-nxpnfc/br_android_ncihalx_m
commit: 907d4a5d0e6c784f22724068e77d2b4ff57c08c4)

Change-Id: I52e1c531ae63cce29fd9f6a22d6556241890f3da
diff --git a/Android.mk b/Android.mk
index 2d5d7e6..3837bd5 100644
--- a/Android.mk
+++ b/Android.mk
@@ -56,7 +56,7 @@
 endif
 
 #### Select the CHIP ####
-NXP_CHIP_TYPE := $(PN551)
+NXP_CHIP_TYPE := $(PN548C2)
 
 ifeq ($(NXP_CHIP_TYPE),$(PN547C2))
 D_CFLAGS += -DNFC_NXP_CHIP_TYPE=PN547C2