Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r265358, r265427, r265777, r265783,
r265806, r265872, r266012 and r266394:

- Multiple DWC OTG host mode related fixes, improvements and optimisations.
- Add full support for ISOCHRONOUS transfers to the DWC OTG driver.
- Use the interrupt filter to handle basic USB FIFO interrupts.
- Fixed unbalanced unlock in case of "dwc_otg_init_fifo()" failure.
- Add common spinlock to the USB bus structure.

MFC r261410

Follow r261352 by updating all drivers which are children of simplebus
to check the status property in their probe routines.

MFC r256839, r256948, r256950, r257299, r257414, r258057, r259090

Add configuration for the Freescale i.MX53 Quick Start Board.

Add the Raspberry Pi BSC (I2C compliant) controller driver.

Add Radxa Rock board (by radxa.com) support.

Digi-CCWMX53: enable ffec and uart, USB.

Add support for Freescale Vybrid Family VF600

Move and rename dwc otg driver to more generic one as it appears to work
for rk3188 SoC based board too.

Move and rename dwc otg driver to more
generic one as it appears to work
for rk3188 SoC based board too.

No objections from: hselasky@
Reviewed by: ray@

Add support for DWC OTG.