wifi: ath12k: refactor ath12k_qmi_alloc_target_mem_chunk()

wifi: ath12k: refactor ath12k_qmi_alloc_target_mem_chunk()

Currently, all QMI target memory types share the same allocation logic within
ath12k_qmi_alloc_target_mem_chunk(). However, for Multi-Link Operation (MLO),
the firmware requests a new MLO global memory region. This memory is shared
across different firmware (SoC) participating in the MLO. To accommodate this
logic change, refactor ath12k_qmi_alloc_target_mem_chunk() and introduce a
helper function ath12k_qmi_alloc_chunk() for memory chunk allocation.
Subsequent patch will add MLO global memory allocation logic.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00210-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
Signed-off-by: Raj Kumar Bhagat <quic_rajkbhag@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://patch.msgid.link/20241211153432.775335-5-kvalo@kernel.org
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>