ci: rename the build options for Ethosn build

In accordance with changes made [1], build options have been renamed
for the Ethosn build.

[1]: https://review.trustedfirmware.org/c/TF-A/
trusted-firmware-a/+/21664

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: Idb57bfaed8edf7ddc1679016d8ba0706174be471
2 files changed