brcm: add firmware for the BCM4358 PCIe device.

This patch adds firmware for the BCM4358 2x2 11ac PCIe device.
Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Change-Id: I5c106e4e216dd7856de1e204a4d568714b015efc
Reviewed-on: http://hnd-swgit.sj.broadcom.com:8080/8118

Signed-off-by: Kyle McMartin <kyle@kernel.org>

WHENCE

@@ -2108,6 +2108,7 @@ File: brcm/brcmfmac4356-pcie.bin
 File: brcm/brcmfmac4356-sdio.bin
 File: brcm/brcmfmac43569.bin
 File: brcm/brcmfmac43570-pcie.bin
+File: brcm/brcmfmac4358-pcie.bin
 File: brcm/brcmfmac43602-pcie.bin
 File: brcm/brcmfmac43602-pcie.ap.bin
 File: brcm/brcmfmac4366b-pcie.bin