KVM: SEV: uapi: fix typo in SEV_RET_INVALID_CONFIG

"INVALID" is misspelt in "SEV_RET_INAVLID_CONFIG". Since this is part of
the UAPI, keep the current definition and add a new one with the fix.

Fix-suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Amit Shah <amit.shah@amd.com>
Message-ID: <20240814083113.21622-1-amit@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>