Fix get the offset of the threshold sensor

According to IPMI Spec:
00h Lower Non-critical - going low
01h Lower Non-critical - going high
02h Lower Critical - going low
03h Lower Critical - going high

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: If0def31bccc0862aaa10c70be2854b467b111cd6
1 file changed