octeontx2-af: cn10k: mcs: Fix copy and paste bug in mcs_bbe_intr_handler()

This code accidentally uses the RX macro twice instead of the RX and TX.

Fixes: 6c635f78

 ("octeontx2-af: cn10k: mcs: Handle MCS block interrupts")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>