MAINTAINERS: Add myself as a reviewer of x86 general architecture support

X86 architecture has always been a focus of my work. I would like to
help to review more related patches.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20241022023628.1743686-1-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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