power: smb-lib: always assume legacy cable and limit ICL

While in DRP the legacy cable detection may fail. When a legacy cable is
detected the legacy input current limits are enforced by hardware.

Always assume a legacy cable since the legacy cable detection will
fail in some cases. Manually enforce the legacy input current limits to
ensure USB stability and compliance. As a side effect, non-legacy 22k
ohm and 10k ohm Rp adapters will be current limited to legacy standards.

To realize this:
- Set a limit of 100mA as soon as type-c is connected and remove that
  limit once PD is confirmed.
- If PD is not confirmed:
  - SDP:   Use 100mA vote until USB PHY updates it to 500/900mA
  - CDP:   Use 1.5A vote
  - DCP:   Use 1.5A vote
  - HVDCP: Use 3A vote

Change-Id: I049a7ee2099acd9e58df1b9417847daec4854af5
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>