ArmPkg: Move IS_DEVICE_PATH_NODE for sharing

Move IS_DEVICE_PATH_NODE into header to share it.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPkg/Include/Library/BdsLib.h

@@ -15,6 +15,9 @@
 #ifndef __BDS_ENTRY_H__
 #define __BDS_ENTRY_H__
 
+#define IS_DEVICE_PATH_NODE(node,type,subtype)    \
+        (((node)->Type == (type)) && ((node)->SubType == (subtype)))
+
 /**
   This is defined by the UEFI specs, don't change it
 **/