monitor:cnfgs:Bonnell: Update tach 1 equation

The Bonnell system will support fans from two different vendors where
the equation:  "tach1_rpm = (target_rpm * factor) + offset"  is slightly
different between the two.

Change the factor and offset values to one that will work for both.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Iffb3f597f4d30b3c3b76edf8950702c0517a59f2
1 file changed