Define a mode for tach sensor timer

Use a single timer on the tach sensors for delaying both nonfunctional
and functional state changes by declaring what mode the timer is in.
Since a fan is either transitioning from a functional state to a
nonfunctional state or vice-versa, enabling the timer in the mode
requested allows the user to define a delay for both of these transition
states.

Tested: Current nonfunctional timer delay operates the same

Change-Id: I0c165355d41d27e1906918953e5226968062ee16
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
4 files changed