ath10k: unregister and remove frag_threshold callback
ath10k: unregister and remove frag_threshold callback

Setting fragmentation threshold has not been supported by
any of firmware versions, hence unregister the callback and
remove the function.

Signed-off-by: Peter Oh <2f655c9759e57674d0e5bb5678ad791bc0e5d3ad@qca.qualcomm.com>
Signed-off-by: Kalle Valo <7081a7d99b8c74c0698a728df19e3915a995d7e1@qca.qualcomm.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs