add dcd_edpt_close() API

[hathach]

Related to #326, #336, #320 #317

check list for adding new dcd API to close an endpoint. This API is needed for supporting

• multiple configuration and
• Alternate Interface.

Although the API will only be used by above usecase, it is probably simple enough to be implemented for all port. Port checklikst

• [ ] Espressif ESP32-S2
• [ ] Microchip SAMD
• [ ] Microchip SAMG
• [ ] Nordic nRF5x
• [ ] Nuvoton NUC120
• [ ] Nuvoton NUC121/125/126
• [ ] Nuvoton NUC505
• [ ] NXP LPC3511
• [ ] NXP LPC17/40
• [ ] NXP Transdimension (18/ iMX RT)
• [ ] Sony CXD56
• [x] STM32 FSDev implemented by #336
• [ ] STM32 Synopsys
• [ ] TI MSP430
• [ ] ValentyUSB eptri (fomu)

[KoLoong]

@hathach Do you have plan to support this API for ESP32-S2? Or any update.

[hathach]

no update and no plan, I will work on it when I got some time. Any PRs is welcome.