qcacmn: Add support to get absolute value

Add qdf API to get absolute value

Change-Id: Ib543cd5b53a48f6f7209bd95827b32041a34d3fe
CRs-Fixed: 3310875

qdf/inc/qdf_util.h

@@ -500,6 +500,11 @@ static inline uint8_t *qdf_get_u32(uint8_t *ptr, uint32_t *value)
 	return ptr + 4;
 }
 
+/**
+ * qdf_abs - Get absolute value
+ */
+#define qdf_abs(x)                           __qdf_abs(x)
+
 /**
  * qdf_ntohs - Convert a 16-bit value from network byte order to host byte order
  */