wifi: ath12k: relocate a few functions in mac.c

wifi: ath12k: relocate a few functions in mac.c

An upcoming change will invoke ath12k_mac_init_arvif(),
ath12k_mac_assign_link_vif(), ath12k_mac_unassign_link_vif(), and
ath12k_mac_remove_link_interface() from a line located above their current
definition. Hence, relocate these functions to above so that these can be
invoked later on.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00130-QCAHKSWPL_SILICONZ-1.97421.5 # Nicolas Escande

Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Tested-by: Nicolas Escande <nico.escande@gmail.com>
Link: https://patch.msgid.link/20250204-unlink_link_arvif_from_chanctx-v2-6-764fb5973c1a@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>