The hardware field `ghwcfg2.numhstchnl` is zero-based, meaning the actual
number of available host channels is `numhstchnl + 1`. This off-by-one
error caused the USB Host controller to report N-1 channels instead of N,
leading to premature "No more HCD channels available" errors when
connecting multiple devices.
This issue affects ESP32-S2, ESP32-S3, and ESP32-P4.
Although the hardware documentation suggests that SCHED_INFO is only used
for periodic channels, empirical evidence shows that omitting this configuration
on non-periodic channels can cause them to freeze.
Therefore, we set this field for all channels to ensure reliable operation.
In Scatter-Gather DMA mode, the USB-DWC will automatically enable
PING protocol if an OUT packet is NACKed by the High-Speed device.
The PING bit must be manually reset.
Previously, we included symbols from soc/usb_dwc_cfg.h and configured
the HAL and LL according to it. Now we get the configuration in runtime
from USB-DWC registers.
Added missing definition for USB FS peripheral on ESP32-P4.
