Revert "brcmfmac: send mailbox interrupt twice for specific hardware device"

This reverts commit 99d94ef3. I accidentally
applied this broken (failed to compile) patch due to a bug in my patchwork
script.
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c

@@ -698,11 +698,7 @@ brcmf_pcie_send_mb_data(struct brcmf_pciedev_info *devinfo, u32 htod_mb_data)
 
 	brcmf_pcie_write_tcm32(devinfo, addr, htod_mb_data);
 	pci_write_config_dword(devinfo->pdev, BRCMF_PCIE_REG_SBMBX, 1);
-
-	/* Send mailbox interrupt twice as a hardware workaround */
-	core = brcmf_chip_get_core(devinfo->ci, BCMA_CORE_PCIE2);
-	if (core->rev <= 13)
-		pci_write_config_dword(devinfo->pdev, BRCMF_PCIE_REG_SBMBX, 1);
+	pci_write_config_dword(devinfo->pdev, BRCMF_PCIE_REG_SBMBX, 1);
 
 	return 0;
 }