qcacmn: Add support for multiple instances of the host driver

Propagation from qcacld-2.0 to qca-wifi-host-cmn.

If the module name is changed to something other than wlan in
Makefile or Kbuild, then MULTI_IF_NAME is defined to be the module name.
When MULTI_IF_NAME is defined, the names for the config files, log files,
and firmware files are prepended or appended with MULTI_IF_NAME. This
prevents file name collisions allowing multiple instances of this driver
to be loaded with different module names.

Change-Id: Id880c5fe423eb0b2a2c01677d8fa7c4a784c74df
CRs-Fixed: 946520

hif/src/ath_procfs.c

@@ -43,7 +43,11 @@
 #include "pld_common.h"
 
 #define PROCFS_NAME             "athdiagpfs"
+#ifdef MULTI_IF_NAME
+#define PROCFS_DIR              "cld" MULTI_IF_NAME
+#else
 #define PROCFS_DIR              "cld"
+#endif
 
 /**
  * This structure hold information about the /proc file