board: tablet: usb: remove HSIC reset pin

Now when issues with cold start of USB is fixed,
we can safely remove resetting of HSIC device

Next HW changes are NOT NEEDED now:

3) modification for reset ability:
	- DNI R322
	- solder a wire from U65.5 to U72.2
4) S1 switches: 7 - OFF, 8 - ON

Change-Id: I4ef7af75441ecde089e40888784198e75a346275
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@ti.com>