drivers: usb_dc_nrfx: remove k_mem_pool_free for IN endpoints

Usage of mem_pool for all IN endpoints was removed in
commit b3c63425a062 ("usb: driver: Reduce Endpoint buffer pool.")
Remove also k_mem_pool_free for all IN endpoints.

Fixes: #30213

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
1 file changed