refactor(changelog): change all occurrences of RSS to RSE

Changes all occurrences of "RSS" and "rss" in the code and build files
to "RSE" and "rse".

Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Change-Id: I66a6c87c158b14e18cba25ea6c6e0809e30008ca
1 file changed