MAINTAINERS: update AMD CRYPTOGRAPHIC COPROCESSOR (CCP) DRIVER - SEV SUPPORT

Brijesh is no longer with AMD.

Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Reviewed-by: Michael Roth <michael.roth@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>