constants/constants.go: Add arch info to admin-helper linux binary

admin-helper now have arm64 and amd64 binary for linux platform. This PR
will make sure correct binary is downloaded and used for specific
platform.

pkg/crc/constants/constants.go

@@ -55,7 +55,7 @@ const (
 
 var adminHelperExecutableForOs = map[string]string{
 	"darwin":  "crc-admin-helper-darwin",
-	"linux":   "crc-admin-helper-linux",
+	"linux":   fmt.Sprintf("crc-admin-helper-linux-%s", runtime.GOARCH),
 	"windows": "crc-admin-helper-windows.exe",
 }