feat(usb): Add ESP32-S31 support in tinyusb

[igi540]

Description

Add ESP32-S31 as a supported MCU in TinyUSB. The S31 uses a DWC2 high-speed OTG controller with a UTMI PHY on Port 0 — unlike ESP32-P4 which has both FS (Port 0) and HS (Port 1) controllers, the S31 has a single HS-only port.

Changes

Core stack (src/)

• Define OPT_MCU_ESP32S31 (911) in tusb_option.h
• Add S31 MCU configuration in tusb_mcu.h: DWC2 HS, 16 endpoints, multi-core, slave/DMA toggle
• Add DWC2 controller entry in dwc2_esp32.h (reg base 0x20300000, 4096 FIFO, ETS_USB_OTGHS_INTR_SOURCE)
• Exclude usb_wrap_struct.h include and USB_WRAP usage — S31 has no USB_WRAP peripheral
• Select USB_PHY_TARGET_UTMI instead of USB_PHY_TARGET_INT for S31 PHY init

Build system

• Add esp32s31 target to idf_component.yml
• Map esp32s31 to OPT_MCU_ESP32S31 in top-level CMakeLists.txt
• Force OPT_MODE_HIGH_SPEED for S31 device/host port speed in family.cmake
• Remove unused tusb_family variable from CMakeLists.txt

BSP

• Add OPT_MCU_ESP32S31 to all TU_CHECK_MCU guard lists in family.c
• Remove empty preprocessor guard block

CI

• Remove --disable-targets esp32s31 from build_and_run_idf_examples.yml and build_and_run_esp_usb_test_apps.yml

Docs

• Add S31 row to supported CPUs table in README.rst
• Add changelog entry in docs/info/changelog.rst

Other

• Fix missing TUP_MCU_MULTIPLE_CORE definition for ESP32-H4

[peter-marcisovsky]

@igi540 Apart from the current build errors related to S31 changes, there will be some run errors, same as in my older PR #77

I have finished another CI fix in #79 which corrects the current CI, just waiting for the CI to finish.
We can merge my #79 first, then you rebase onto my changes and will enable S31.

[tore-espressif]

@igi540 LGTM, but please check the failing MSC example build in CI.

It might be related to missing defaults for MSC buffer sizes https://github.com/espressif/esp-usb/blob/master/device/esp_tinyusb/Kconfig#L139

If the required fix is only in esp_tinyusb, we can merge this PR and continue working on esp_tinyusb

[igi540]

@igi540 LGTM, but please check the failing MSC example build in CI.

It might be related to missing defaults for MSC buffer sizes https://github.com/espressif/esp-usb/blob/master/device/esp_tinyusb/Kconfig#L139

If the required fix is only in esp_tinyusb, we can merge this PR and continue working on esp_tinyusb

Thanks for the review! All the CI build errors are caused by a single issue — the missing default value for TINYUSB_MSC_BUFSIZE on esp32s31 in esp_tinyusb/Kconfig. When the value is not set, CFG_TUD_MSC_EP_BUFSIZE expands to nothing, which causes the static assert, buffer declaration, and all subsequent references to _mscd_epbuf to fail.

I verified this locally by adding the appropriate default in esp_tinyusb/Kconfig, and the MSC example builds successfully for esp32s31 after that change.

Since the fix is only needed in esp_tinyusb, I agree we can merge this PR and address the Kconfig default separately.