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-quanta rev: 8158024f02f58e04bae6677a5703d4e69d990877)

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Change-Id: Ic21f54a1f21529d4e36d5111fb4562f2581b4c82
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>