CLEANUP: quic: clean up include on quic_frame-t.h

quic_frame-t.h and xprt_quic-t.h include themselves mutually. This may
cause some troubles later.

In fact, xprt_quic does not need to include quic_frame so remove this.
And as quic_frame is a generic source file which is included in multiple
places, it is useful to also remove the xprt_quic include in it. Use
forward declaration for this.
2 files changed