dwc: Set the packet length in the TX descriptors of the QoS core

[manu]

Summary

The QoS core expects the total length of the packet in the low bits of
TDES3. Linux and U-Boot both fill it in, but txdesc_setup() only wrote
the flags there. Pass the length of the whole packet down and write it
to every descriptor of the packet.

[br]

sys/dev/dwc/dwc4_dma.c

114–115

looks like the macro already exists in the previous line?
although the existing macro is valid when TSE (tcp segmentation offload) bit is set. If TSE is not set, it is indeed 0x7fff

183

[br]

sys/dev/dwc/dwc4_dma.c

114–115

Actually, it looks like this entire packet-length field is reserved when TSE is not used ?
If TSE is used, then it is 0x3ffff << 0.

[br]

sys/dev/dwc/dwc4_dma.c

115