Remove 'scale' parameter from the sensor interface in IPMI sensors YAML files

Support for the Scale property on the sensor Value interface was dropped
in the phosphor-hwmon commit ecac0ae208cfc437 ("Fixes for when sensor value
is a double").

(From meta-lenovo rev: 95fc122925c1370e9fe5bb7785ef76ea727d8d12)

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Change-Id: I874cbaf58382eb4d71c863959037a3dbca6955a9
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>