Update dwc2_stm32.h

[Nikitarc]

Support STM32H7 with only 1 USB port: H72x / H73x / H7Ax / H7Bx
Avoid GCC compiler warnings when -pedantic option is used (strict ISO C)

Describe the PR
The STM32H7 family have 2 sub families:

• H74x and H75x have 2 USB, and USB2 have an internal FS PHY. No problem with this sub family.
• H72x, H73x, H7Ax, H7Bx have only 1 USB named USB1 with an internal FS PHY (this USB1 is equivalent to the USB2 of the other sub family). And in the CMSIS files of this sub family the values USB_OTG_FS_PERIPH_BASE and OTG_FS_IRQn are not declared, so the file synopsys/dwc2/dwc2_stm32.h produce compile errors.

Add to tusb_options.h
typedef int make_iso_compilers_happy ;

Additional context
Successfully tested on NUCLEO-H723ZG (1 USB) and NUCLEO-H743ZI (2 USB).
fixes #1431

[hathach]

missing #endif

[hathach]

seems like you miss an #endif, please make sure you compile the example and verify the changes works

[Nikitarc]

Sorry this is my first PR, and I got confused.
I'm sure it works now.

[Nikitarc]

These warning:

..\TinyUSB\src\class\msc\msc_host.c:499: warning: ISO C forbids an empty translation unit [-Wpedantic]

[hathach]

thank you for your PR. Sorry for the late response.