board: tablet: usb: enable HSIC disconnect-reconnect

Next HW changes needed on Tablet2 before applying this
patch:
	- DNI C230

Switch S5 may be used for emulating HSIC disconnect-reconnect,
or be in the 'OFF' state if connected to Device's AUX.

Change-Id: I8084d929b8f05c541af1caf12b1bc3ef007035d9
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@ti.com>