brcm/ap*: Setup for different boards/transceivers/firmwares

The current Broadcom FullMAC driver embedded in the S905X linux kernel
needs at configuration time the location of the firmware and NVRAM
file. This is a problem when we have two different boards equipped with
two different broadcom chipsets using the same driver + kernel
configuration, like for TCL and ProConcept/AP boards.

In this situation each board (actaully the brcm driver) needs at least a
set of three board-specific files:

1) Firmware data
2) Config file
3) NVRAM file

We can actually force the brcm driver to automatically search for the
correct set (naming) of files.

a) Firmware data: if the driver defines FW_PATH_AUTO_SELECT, the
firmware file name is automatically generated using the initial
information on the transceiver and the file location (directory) can be
specified by CONFIG_BCMDHD_FW_PATH

b) Config file: if the driver defines CONFIG_PATH_AUTO_SELECT again the
config file name is determined by the chip id and the location
(directory) is determined by CONFIG_BCMDHD_NVRAM_PATH

c) NVRAM: in this case explicitly specifying a NVRAM file in the config
file has higher priority over CONFIG_BCMDHD_NVRAM_PATH. This means that
we can specify the path of the NVRAM file using the 'nv_by_chip='
parameter in the config file.

What we are doing with this patch is linking all the board-specific
file into the general directory /lib/firmware/brcm/ and with a kernel
patch we are going to make both CONFIG_BCMDHD_FW_PATH and
CONFIG_BCMDHD_NVRAM_PATH pointing here. The driver modified with the
correct defines will be able to pickup from here the correct files it
needs.
Signed-off-by: Carlo Caione <carlo@endlessm.com>

brcm/ap6255/config.txt

 kso_enable=0
 ccode=CN
 regrev=38
+nv_by_chip=1 17221 6 nvram_43455c0.txt

brcm/ap6356s/config.txt

@@ -5,3 +5,4 @@ use_rxchain=1
 tcpack_sup_mode=1
 tx_in_rx=0
 dhd_rxbound=64
+nv_by_chip=1 17238 2 nvram_4356a2.txt

brcm/config_43455c0.txt

+ap6255/config.txt
\ No newline at end of file

brcm/config_4356a2.txt

+ap6356s/config.txt
\ No newline at end of file

brcm/fw_bcm43455c0_ag.bin

+ap6255/fw_bcm43455c0_ag.bin
\ No newline at end of file

brcm/fw_bcm4356a2_ag.bin

+ap6356s/fw_bcm4356a2_ag.bin
\ No newline at end of file

brcm/nvram_43455c0.txt

+ap6255/nvram.txt
\ No newline at end of file

brcm/nvram_4356a2.txt

+ap6356s/nvram_ap6356.txt
\ No newline at end of file