riscv: kvm: fix non-kernel-doc comment block

Don't use "/**" to begin a comment block for a non-kernel-doc comment.

Prevents this docs build warning:

vcpu_sbi.c:3: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * Copyright (c) 2019 Western Digital Corporation or its affiliates.

Fixes: dea8ee3 ("RISC-V: KVM: Add SBI v0.1 support")
Signed-off-by: Randy Dunlap <[email protected]>
Reported-by: kernel test robot <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Anup Patel <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Paul Walmsley <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Albert Ou <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

arch/riscv/kvm/vcpu_sbi.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
-/**
+/*
  * Copyright (c) 2019 Western Digital Corporation or its affiliates.
  *
  * Authors: