KVM: SVM: Add support for KVM_SEV_LAUNCH_UPDATE_DATA command

The command is used for encrypting the guest memory region using the VM
encryption key (VEK) created during KVM_SEV_LAUNCH_START.

Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: "Radim Krčmář" <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Improvements-by: Borislav Petkov <[email protected]>
Signed-off-by: Brijesh Singh <[email protected]>
Reviewed-by: Borislav Petkov <[email protected]>

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