linux-firmware/i915: Step away from symbolic links and clean up repo.

i915 now loads the specific major/minor version of the firmware
instead of loading the symbolic links.

So this patch also removes symbolic links from the firmware
components that never had the firmware loaded directly and
let the symbolic links only for the cases where some versions
of i915 might load the symbolic link while new versions loads
the file directly.

I considered making copies but this would
increase this repository size in ~ 25%.

The symbolic links now on shall never be updated.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

WHENCE

@@ -3097,28 +3097,18 @@ Licence: Redistributable. See LICENCE.cavium for details
 
 Driver: i915 -- Intel Integrated Graphics driver
 
-File: i915/skl_dmc_ver1_23.bin
 File: i915/skl_dmc_ver1_26.bin
-
 File: i915/skl_dmc_ver1.bin
 Version: DMC API/ABI ver 1 - release 26 for Skylake
 
-File: i915/bxt_dmc_ver1_04.bin
-File: i915/bxt_dmc_ver1_05.bin
-File: i915/bxt_dmc_ver1_06.bin
 File: i915/bxt_dmc_ver1_07.bin
-
 File: i915/bxt_dmc_ver1.bin
 Version: DMC API/ABI ver 1 - release 07 for Broxton
 
 File: i915/kbl_dmc_ver1_01.bin
-
 File: i915/kbl_dmc_ver1.bin
 Version: DMC API/ABI ver 1 - release 01 for Kabylake
 
-File: i915/skl_guc_ver1_1059.bin
-File: i915/skl_guc_ver4_3.bin
-
 File: i915/skl_guc_ver1.bin
 Version: Guc API/ABI ver 1 - release 1059 for Skylake
 

i915/skl_guc_ver1.bin

-skl_guc_ver1_1059.bin
\ No newline at end of file

i915/skl_guc_ver4.bin

-skl_guc_ver4_3.bin
\ No newline at end of file