moving the variable to efr32_sdk.gni to make it available everywhere

Author: chirag-silabs

examples/platform/silabs/SiWx917/BUILD.gn

@@ -50,8 +50,6 @@ declare_args() {
 
 # Sanity check
 assert(chip_enable_wifi)
-
-silabs_common_plat_dir = "${chip_root}/examples/platform/silabs"
 silabs_plat_si91x_wifi_dir = "${chip_root}/src/platform/silabs/SiWx917/wifi"
 import("${silabs_common_plat_dir}/args.gni")
 

examples/platform/silabs/efr32/BUILD.gn

@@ -48,8 +48,6 @@ declare_args() {
   sl_test_event_trigger_enable_key = "00112233445566778899AABBCCDDEEFF"
 }
 
-silabs_common_plat_dir = "${chip_root}/examples/platform/silabs"
-
 import("${silabs_common_plat_dir}/args.gni")
 
 # Sanity check

third_party/silabs/efr32_sdk.gni

@@ -84,6 +84,7 @@ declare_args() {
 
 examples_plat_dir = "${chip_root}/examples/platform/silabs/efr32"
 silabs_plat_efr32_wifi_dir = "${chip_root}/src/platform/silabs/efr32/wifi"
+silabs_common_plat_dir = "${chip_root}/examples/platform/silabs"
 is_series_2 = silabs_family == "mgm24" || silabs_family == "efr32mg24" ||
               silabs_family == "efr32mg26"