kernel: fix bgmac compilation in kernel 5.10

It's required since upstream kernel commit 4bdc0d676a64 ("remove
ioremap_nocache and devm_ioremap_nocache").

Signed-off-by: Rafał Miłecki <[email protected]>

target/linux/generic/hack-5.10/773-bgmac-add-srab-switch.patch

@@ -55,7 +55,7 @@ Signed-off-by: Hauke Mehrtens <[email protected]>
  	net_dev->max_mtu = BGMAC_RX_MAX_FRAME_SIZE - ETH_FCS_LEN;
  
 +	if ((bgmac->feature_flags & BGMAC_FEAT_SRAB) && !bgmac_b53_pdata.regs) {
-+		bgmac_b53_pdata.regs = ioremap_nocache(0x18007000, 0x1000);
++		bgmac_b53_pdata.regs = ioremap(0x18007000, 0x1000);
 +
 +		err = platform_device_register(&bgmac_b53_dev);
 +		if (!err)