wl12xx: fix some sparse warnings

Note that wl1271_write32() calls cpu_to_le32() by itself, so calling
wl1271_write32(addr, cpu_to_le32(val)) is in fact a bug on BE systems.

Fix the following sparse warnings:

drivers/net/wireless/wl12xx/cmd.c:662:16: warning: incorrect type in assignment (different base types)
drivers/net/wireless/wl12xx/cmd.c:662:16:    expected unsigned short [unsigned] [addressable] [usertype] llc_type
drivers/net/wireless/wl12xx/cmd.c:662:16:    got restricted __be16 [usertype] <noident>
drivers/net/wireless/wl12xx/cmd.c:674:17: warning: incorrect type in assignment (different base types)
drivers/net/wireless/wl12xx/cmd.c:674:17:    expected unsigned int [unsigned] [addressable] [usertype] sender_ip
drivers/net/wireless/wl12xx/cmd.c:674:17:    got restricted __be32 [usertype] ip_addr
drivers/net/wireless/wl12xx/rx.c:202:4: warning: incorrect type in argument 3 (different base types)
drivers/net/wireless/wl12xx/rx.c:202:4:    expected unsigned int [unsigned] [usertype] val
drivers/net/wireless/wl12xx/rx.c:202:4:    got restricted __le32 [usertype] <noident>
drivers/net/wireless/wl12xx/acx.c:1247:23: warning: incorrect type in assignment (different base types)
drivers/net/wireless/wl12xx/acx.c:1247:23:    expected restricted __le32 [usertype] ht_capabilites
drivers/net/wireless/wl12xx/acx.c:1247:23:    got unsigned long
drivers/net/wireless/wl12xx/acx.c:1250:24: warning: invalid assignment: |=
drivers/net/wireless/wl12xx/acx.c:1250:24:    left side has type restricted __le32
drivers/net/wireless/wl12xx/acx.c:1250:24:    right side has type unsigned long
drivers/net/wireless/wl12xx/acx.c:1253:24: warning: invalid assignment: |=
drivers/net/wireless/wl12xx/acx.c:1253:24:    left side has type restricted __le32
drivers/net/wireless/wl12xx/acx.c:1253:24:    right side has type unsigned long
drivers/net/wireless/wl12xx/acx.c:1256:24: warning: invalid assignment: |=
drivers/net/wireless/wl12xx/acx.c:1256:24:    left side has type restricted __le32
drivers/net/wireless/wl12xx/acx.c:1256:24:    right side has type unsigned long

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>