phosphor-ipmi-host: Set event msg buffer flag to hardcode to 0x0

Though event message buffer is not supported for 5.10 kernel request
the BMC is set to return msg buffer is hardcoded to return full 0x2;
instead of 0x0.

Signed-off-by: XP Chen <xiao-peng.chen@fii-na.com>
Change-Id: I92674dbdb54546653ff2b18574f3d8dfa21ae43f
1 file changed