docs(maintainers): make Jimmy Brisson a code owner

For the following modules:
- Trusted boot
- Measured boot
- cert_create tool
- PSA layer.

Change-Id: I18113441a947773b470904573e1b474a2c8e2941
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
1 file changed