atl1c: fix issue of io access mode for AR8152 v2.1
When io access mode is enabled by BOOTROM or BIOS for AR8152 v2.1, the register can't be read/write by memory access mode. Clearing Bit 8 of Register 0x21c could fixed the issue. Signed-off-by: Cloud Ren <cjren@qca.qualcomm.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: xiong <xiong@qca.qualcomm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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