qcacmn: add APIs to access CMEM

Adding write/read APIs for accessing the CMEM.

Currently in QCA6750, UMAC and CE windows are statically mapped,
a new static window for CMEM is added for CMEM transactions.

Change-Id: Ie10b33a6f468c6e4db314ea85856414962ef29e3
CRs-Fixed: 2771193

hal/wifi3.0/hal_hw_headers.h

@@ -122,6 +122,12 @@
 #define HAL_REG_READ(_soc, _offset) \
 	hal_read32_mb(_soc, (_offset))
 
+#define HAL_CMEM_WRITE(_soc, _reg, _value) \
+	hal_write32_mb_cmem(_soc, (_reg), (_value))
+
+#define HAL_CMEM_READ(_soc, _offset) \
+	hal_read32_mb_cmem(_soc, (_offset))
+
 #define WBM_IDLE_DESC_LIST 1
 
 /**