qcom: smb-lib: fix adapter allowance for PM660

Update the adapter allowance configuration from 5_TO_9V
continuous mode to 5_OR_9V discrete mode, this allows
hardware to detect Over-voltage for 5V adapter.

CRs-Fixed: 1104289
Change-Id: Ie43febb92e5a6e52ce17779d8cea91cbdd2011cb
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>