eth: fbnic: Set AW_FLUSH_MODE alongside AW_FLUSH when flushing the mailbox

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                        "drivers/net/ethernet/meta/fbnic/fbnic_csr.h",
                        "drivers/net/ethernet/meta/fbnic/fbnic_fw.c"
                    ],
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                    "vendor": "Linux",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/meta/fbnic/fbnic_csr.h",
                        "drivers/net/ethernet/meta/fbnic/fbnic_fw.c"
                    ],
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                            "version": "7.3",
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