Remove CFG_TUSB_DEBUG for rp2350

[Yveaux]

This change removes the default define of setting CFG_TUSB_DEBUG to 0 for rp2350 targets and allows a user to change the TUSB debug level at compile time.

This default is not present for rp2040 targets (https://github.com/earlephilhower/arduino-pico/blob/163b209d6c60733f110b02b9cb5f0b3c48970955/lib/rp2040/platform_def.txt)

And it defaults to 0 anyway:

arduino-pico/include/rp2350/tusb_config.h

Line 46 in 163b209

#define CFG_TUSB_DEBUG 0

)

[earlephilhower]

Seems fine. I just cut-n-pasted the entire Cmake define list for the rp2350 and I get many others are really defaults as well.