usb: penwell_otg: add charging current negotiation and notification support
This patch adds charging current negotiation in Transceiver driver for
SDP/CDP/DCP cases and it also provides notification/query interfaces to
Battery driver for charging current information notification.
*It requires device controller/gadget driver modification to fully
support SDP/CDP cases.
Change-Id: I2d7db99bf16423d308a738bdc25206d9a90e2db4
Signed-off-by: Hao Wu <hao.wu@intel.com>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>