qcom-charger: qpnp-smb2: configure float options from DT

When a float charger is detected by APSD there are configuration options
that change the behavior of the charger. These options should be
configurable from the device tree. Add a DT parameter "qcom,float-option"
and configure it as follows:
1 - Treat as a DCP
2 - Treat as a SDP
3 - Disable charging
4 - Suspend USB input

Change-Id: Ia9219bc232f2092569dfb1a14f628e788173c4ff
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>