ath11k: disable regdb support for QCA6390

Currently it does not have regdb files for QCA6390, so disable its regdb
support feature now.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-05266-QCAHSTSWPLZ_V2_TO_X86-1
Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220319023543.14288-3-quic_wgong@quicinc.com

drivers/net/wireless/ath/ath11k/core.c

@@ -219,7 +219,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.num_peers = 512,
 		.supports_suspend = true,
 		.hal_desc_sz = sizeof(struct hal_rx_desc_ipq8074),
-		.supports_regdb = true,
+		.supports_regdb = false,
 		.fix_l1ss = true,
 		.credit_flow = true,
 		.max_tx_ring = DP_TCL_NUM_RING_MAX_QCA6390,