implement msc device class

usbd auto stall control for not supported return from class control request
usbd implement xfer isr callback mechanism
DCD
- implement dcd multiple qtd support
- dcd dcd_pipe_stall
- implement dcd_pipe_queue_xfer
- xfer_complete_isr
- flush control endpoint if received new setup while previous transfer is not complete
change msc_cmd_block_wrapper_t flags field to dir
force full speed for easy testing

NOTEs: somehow unable to get endpoint IN interrupt with ioc

tinyusb/host/ehci/ehci.h

@@ -291,7 +291,7 @@ typedef struct {
 
 	/// SITD is 32-byte aligned but occupies only 28 --> 6 bytes for storing extra data
 	uint8_t used;
-	uint8_t IhdIdx;
+	uint8_t ihd_idx;
 	uint8_t reserved2[2];
 }ATTR_ALIGNED(32) ehci_sitd_t;