SenseApiDesc: use CPP concat to reduce typos

include/preprocessor.h

@@ -4,6 +4,8 @@
 #define HK_Q(x) #x
 #define HK_QUOTE(x) HK_Q(x)
 
+#define HK_CONCAT(a, b) a ## b
+
 #define HK_UNMANGLED "C"
 
 #endif // HK_PREPROCESSOR_H

include/user/senseApiDesc.h

@@ -121,8 +121,10 @@ public:
 #define HK_GET_SENSE_API_DESC_FN_NAME getSenseApiDesc
 #define HK_GET_SENSE_API_DESC_FN_NAME_STR \
     HK_QUOTE(HK_GET_SENSE_API_DESC_FN_NAME)
+#define HK_GET_SENSE_API_DESC_FN_TYPEDEF \
+    HK_CONCAT(HK_GET_SENSE_API_DESC_FN_NAME, Fn)
 
-typedef const SenseApiDesc &(getSenseApiDescFn)(void);
+typedef const SenseApiDesc &(HK_GET_SENSE_API_DESC_FN_TYPEDEF)(void);
 
 } // namespace sense_api
 } // namespace hk