qcom: smb1351: add support for reporting INPUT_SUSPEND property

Add support to report INPUT_SUSPEND state in case of slave charger
configuration. This is used by user-space to determine parallel
charger state.

Change-Id: I97a7c18180c0aceddd2b90177949f87487aad22b
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>