usb: dwc2: host: use true/false for boolean

For boolean variables true/false is preferred over 1/0 for readability.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>