power: smb5: Disable SMB thermal regulation

Disable SMB temp sensing/regulation for both SMB1355 and SMB1390.

SMB1390 has its own over-temp shutdown and has thermal balancing
SW to adjust PM/SMB charger current ratio using VBUS/VWLS.

SMB1355 has both CTM and thermal balance to regulate SMB ICHG.

Change-Id: I9fdedbb4055dc757187531d6aa0b5394c3916c1c
Signed-off-by: Harry Yang <harryy@codeaurora.org>