Add trixie OVMF keys

Hello @patersonc

Please review the changes and provide your feedback.

The trixie OVMF keys are required for below scenarios,

• zchunk based swupdate as isar-cip-core supports zchunk only for trixie
• verify the secure boot mismatch keys

Thanks & Regards Shivanand K

Signed-off-by: Shivanand Kunijadar Shivanand.Kunijadar@toshiba-tsip.com