Add DPDK definition to DOXYGEN

Change-Id: I04e8663b49b5f706940b7aada0a7c2cae913a82b
Signed-off-by: Keith Burns (alagalah) <alagalah@gmail.com>
diff --git a/doxygen/doxygen.cfg b/doxygen/doxygen.cfg
index 85c6829..0eadbd7 100644
--- a/doxygen/doxygen.cfg
+++ b/doxygen/doxygen.cfg
@@ -2045,8 +2045,9 @@
 	__x86_64__ __X86_64__ __linux__ __LINUX__ __64BIT__ __64bit__ \
 	__ORDER_LITTLE_ENDIAN__=1234 \
 	__BYTE_ORDER__=1234 \
-	__FLOAT_WORD_ORDER__=1234
-
+	__FLOAT_WORD_ORDER__=1234 \
+	DPDK=1
+	
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The
 # macro definition that is found in the sources will be used. Use the PREDEFINED