power: smb5-lib: Report smb_health based on CP status

The SMB temp reports a high value when CP is not enabled,
this leads SMB health to report an OVERHEAT status.
Avoid this by reporting UNKNOWN health status when CP
is not enabled.

Change-Id: I80ed9f7fb9d1d38b7c6a8eae9f8af9fb71a28fb1
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
Signed-off-by: Sahil Chandna <chandna@codeaurora.org>