[Silabs] : Cleanup and applying coding guideline on Silabs code (#25977)

* 917 SoC cleanup and some modifications

* removing some files which were not used

* Refactor : Applying Coding guideline of Silabs src/platform

* some fixes for 917 SoC

* Restyler changes

* Restyler changes

* code standard changes in rs911x folder

* Review comment solved

* Restyled by clang-format

* Build issue solved

---------

Co-authored-by: Chirag Bansal <[email protected]>
Co-authored-by: Restyled.io <[email protected]>

Author: 3 people

examples/platform/silabs/SiWx917/BUILD.gn

@@ -231,7 +231,6 @@ source_set("siwx917-common") {
     ".",
     "SiWx917/",
     "${wifi_sdk_dir}",
-    "${wifi_sdk_dir}/hal",
   ]
 
   sources = [