xr-smrtvwr-misc: XR SMRTVWR Misc drivers

Following drivers are added to support xr smartviewer reference device.
These drivers are needed to support different chips that are used
in the xr smartviewer reference device. These chips are enabled
and used in smartviewer reference device.
1. qcom-xr-smrtvwr-misc.c - Supports enabling regulator, gpios.
2. tusb1064.c - i2c driver for USB redriver from TI TUSB1064 chip.
3. vxr7200.c - i2c driver for DP2DSI bridge driver from Synaptics
   VXR7200 chip.

Change-Id: I411ceac66882cec840ae63ca2e5a19920bbdeef2
Signed-off-by: Rajesh Bharathwaj <rajeshbharathwaj@codeaurora.org>