ReadOnlyRootFileSystem changes for aws

commit 07616481 Author: Abhay bios@amazon.com Date: Tue Mar 21 2023 07:29:13 GMT-0700 (Pacific Daylight Time)

Renaming variable

commit c5090b92 Author: Abhay bios@amazon.com Date: Mon Mar 20 2023 10:44:55 GMT-0700 (Pacific Daylight Time)

adding changes for rootFilesystem

(cherry picked from commit 7e5a792d)