Bluetooth: Add symbolic links for Intel Pulsar firmware variants

Different variants of the Intel Pulsar Bluetooth controller use the same
firmware file name (ibt-17*, ibt-18* and associated files).

Create symbolic links to the common firmware files instead of duplicating
them. This reduces firmware storage space on the filesystem.

Signed-off-by: Kiran K <kiran.k@intel.com>

WHENCE

@@ -4190,31 +4190,27 @@ Version: BT_WindStormPeak_REL1299
 
 File: intel/ibt-17-16-1.sfi
 File: intel/ibt-17-16-1.ddc
-File: intel/ibt-17-2.sfi
-File: intel/ibt-17-2.ddc
+Link: intel/ibt-17-2.sfi -> ibt-17-16-1.sfi
+Link: intel/ibt-17-2.ddc -> ibt-17-16-1.ddc
+
 File: intel/ibt-18-16-1.sfi
 File: intel/ibt-18-16-1.ddc
-File: intel/ibt-18-2.sfi
-File: intel/ibt-18-2.ddc
+Link: intel/ibt-18-2.sfi -> ibt-18-16-1.sfi
+Link: intel/ibt-18-2.ddc -> ibt-18-16-1.ddc
 Version: BT_Pulsar_REL20425_22.20.2412.20425
 
 File: intel/ibt-17-0-1.sfi
-Version: BT_JeffersonPeak_A0_B0_REL0201
 File: intel/ibt-17-0-1.ddc
-Version: BT_JeffersonPeak_A0_B0_REL0201
-File: intel/ibt-17-1.sfi
-Version: BT_JeffersonPeak_A0_B0_REL0201
-File: intel/ibt-17-1.ddc
+Link: intel/ibt-17-1.sfi -> ibt-17-0-1.sfi
+Link: intel/ibt-17-1.ddc -> ibt-17-0-1.ddc
 Version: BT_JeffersonPeak_A0_B0_REL0201
 
 File: intel/ibt-18-0-1.sfi
-Version: BT_ThunderPeak_A0_B0_REL0201
 File: intel/ibt-18-0-1.ddc
+Link: intel/ibt-18-1.sfi -> ibt-18-0-1.sfi
+Link: intel/ibt-18-1.ddc -> ibt-18-0-1.ddc
 Version: BT_ThunderPeak_A0_B0_REL0201
-File: intel/ibt-18-1.sfi
-Version: BT_ThunderPeak_A0_B0_REL0201
-File: intel/ibt-18-1.ddc
-Version: BT_ThunderPeak_A0_B0_REL0201
+
 File: intel/ibt-20-0-3.sfi
 Version: BT_CyclonePeak_A0_REL53636
 File: intel/ibt-20-0-3.ddc