headers: Add pvpanic.h

Since 2020, linux kernel started to export pvpanic.h. Import the
latest version from linux into QEMU.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <2022022

headers: Add pvpanic.h

Since 2020, linux kernel started to export pvpanic.h. Import the
latest version from linux into QEMU.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20220221122717.1371010-1-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

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