fix(host): release spinlock in tuh_deinit to fix multi-rebuild panic

tuh_rhport_init() calls osal_spin_init(&_usbh_spin), which under OPT_OS_PICO
claims a hardware spinlock via critical_section_init(). There was no
osal_spin_deinit(), so tuh_deinit() never released it: every host init/deinit
cycle leaked one spinlock. RP2350 has a small spinlock pool, so a few usb_host
rebuilds exhaust it and hw_claim_unused_from_range() panics (the long-standing
"crashes on the 4th rebuild" bug).

Add osal_spin_deinit() to all OSAL backends (critical_section_deinit for pico;
no-op for none/freertos) and call it in tuh_deinit(). Verified 20/20
deinit+rebuild cycles on RP2350-Zero and Waveshare RP2350-USB-A (previously
panicked on the 4th).

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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