[Silabs] Folder structure introduction for addition of SiWx917 (project-chip#23736)

* src/platform/silabs folder changes

* examples/lighting-app and examples/platform folder modification for silabs/efr32

* Skeleton for the SiWx917 folder

* CI fix for the lighting app due to modified folder structure

* Revert "Skeleton for the SiWx917 folder"

This reverts commit bbe322d.

* Build changes for different applications

* Restyle PR

* Fixing the build failures

* fixing the lock app

* updating the dry run efr32 for the new folder structure]

* Added a variable for the BUILD.gn file

* restyle the last commit

* src/platform/silabs folder changes

* examples/lighting-app and examples/platform folder modification for silabs/efr32

* Skeleton for the SiWx917 folder

* CI fix for the lighting app due to modified folder structure

* Revert "Skeleton for the SiWx917 folder"

This reverts commit bbe322d.

* Build changes for different applications

* Restyle PR

* Fixing the build failures

* fixing the lock app

* updating the dry run efr32 for the new folder structure]

* Added a variable for the BUILD.gn file

* restyle the last commit

Author: chirag-silabs

.github/workflows/examples-efr32.yaml

@@ -101,7 +101,7 @@ jobs:
       - name: Build example EFR32 Lighting App for BRD4161A with RPCs
         timeout-minutes: 15
         run: |
-          scripts/examples/gn_efr32_example.sh examples/lighting-app/efr32/ out/lighting_app_debug_rpc BRD4161A "is_debug=false" \
+          scripts/examples/gn_efr32_example.sh examples/lighting-app/silabs/efr32/ out/lighting_app_debug_rpc BRD4161A "is_debug=false" \
             disable_lcd=true 'import("//with_pw_rpc.gni")'
           .environment/pigweed-venv/bin/python3 scripts/tools/memory/gh_sizes.py efr32 BRD4161A+rpc lighting-app \
             out/lighting_app_debug_rpc/BRD4161A/chip-efr32-lighting-example.out /tmp/bloat_reports/
@@ -118,7 +118,7 @@ jobs:
       - name: Build example EFR32+RS911x WiFi Lighting app for BRD4161A
         timeout-minutes: 15
         run: |
-          scripts/examples/gn_efr32_example.sh examples/lighting-app/efr32/ out/lighting_app_wifi_rs911x BRD4161A --wifi rs911x
+          scripts/examples/gn_efr32_example.sh examples/lighting-app/silabs/efr32/ out/lighting_app_wifi_rs911x BRD4161A --wifi rs911x
           .environment/pigweed-venv/bin/python3 scripts/tools/memory/gh_sizes.py efr32 BRD4161A+rs911x lighting-app \
             out/lighting_app_wifi_rs911x/BRD4161A/chip-efr32-lighting-example.out /tmp/bloat_reports/
       - name: Clean out build output

config/efr32/lib/pw_rpc/BUILD.gn

@@ -24,7 +24,7 @@ static_library("pw_rpc") {
   public_deps = [
     "$dir_pw_rpc:server",
     "$dir_pw_rpc/nanopb:echo_service",
-    "${chip_root}/examples/platform/efr32/pw_sys_io:pw_sys_io_efr32",
+    "${chip_root}/examples/platform/silabs/efr32/pw_sys_io:pw_sys_io_efr32",
     "${dir_pigweed}/pw_hdlc:pw_rpc",
     dir_pw_assert,
     dir_pw_checksum,