x86/sev: Make boot_ghcb_page[] static
boot_ghcb_page is not used by any other file, so make it static. This also resolves sparse warning: arch/x86/boot/compressed/sev.c:28:13: warning: symbol 'boot_ghcb_page' was not declared. Should it be static? Signed-off-by: GUO Zihua <guozihua@huawei.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: linux-kernel@vger.kernel.org
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