staging/wilc1000: fix Kconfig dependencies

The newly added wilc1000 driver lacks several Kconfig dependencies,
resulting in a multitude of randconfig build errors, e.g.:

drivers/built-in.o: In function `WILC_WFI_mgmt_tx_cancel_wait':
binder.c:(.text+0x12bd28): undefined reference to `cfg80211_remain_on_channel_expired'
drivers/built-in.o: In function `WILC_WFI_CfgSetChannel':
binder.c:(.text+0x12c9d8): undefined reference to `ieee80211_frequency_to_channel'
drivers/built-in.o: In function `WILC_WFI_CfgAlloc':
binder.c:(.text+0x132530): undefined reference to `wiphy_new_nm'
drivers/built-in.o: In function `wilc_netdev_init':
binder.c:(.text+0x1356d0): undefined reference to `register_inetaddr_notifier'
drivers/built-in.o: In function `linux_spi_init':
binder.c:(.text+0x210a68): undefined reference to `spi_register_driver'

This change ensures that we always have at least one of SPI or MMC
enabled, and are only able to pick an interface that works. It also
adds all the missing dependencies for networking infrastructure
(cfg80211, wext, and ipv4).

In order to make it readable, I also took the liberty of re-indenting
the Kconfig file to the normal conventions.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/Kconfig

 config WILC1000
 	tristate "WILC1000 support (WiFi only)"
 	depends on !S390
+	depends on CFG80211 && WEXT_CORE && INET
+	depends on MMC || SPI
 	---help---
 	  This module only support IEEE 802.11n WiFi.
 
@@ -9,7 +11,7 @@ choice
         depends on WILC1000
         default WILC1000_PREALLOCATE_AT_LOADING_DRIVER
 
-        config WILC1000_PREALLOCATE_AT_LOADING_DRIVER
+config WILC1000_PREALLOCATE_AT_LOADING_DRIVER
 	bool "Preallocate memory at loading driver"
 	---help---
 	  This choice supports static allocation of the memory
@@ -17,7 +19,7 @@ choice
 	  during initial time. The driver will also free the buffer
 	  by calling network device stop.
 
-        config WILC1000_DYNAMICALLY_ALLOCATE_MEMROY
+config WILC1000_DYNAMICALLY_ALLOCATE_MEMROY
         bool "Dynamically allocate memory in real time"
         ---help---
 	  This choice supports dynamic allocation of the memory
@@ -25,7 +27,6 @@ choice
 	  when it is required.
 endchoice
 
-
 choice
 	prompt "Bus Type"
 	depends on WILC1000
@@ -35,17 +36,19 @@ choice
 	bool "SDIO support"
 	depends on MMC
 	---help---
-			This module adds support for the SDIO interface of adapters using
-			WILC chipset. Select this if your platform is using the SDIO bus. 
+	  This module adds support for the SDIO interface
+	  of adapters using WILC chipset. Select this if
+	  your platform is using the SDIO bus.
 
 	config WILC1000_SPI
+	depends on SPI
 	bool "SPI support"
 	---help---
-			This module adds support for the SPI interface of adapters using
-			WILC chipset. Select this if your platform is using the SPI bus. 
+	  This module adds support for the SPI interface
+	  of adapters using WILC chipset. Select this if
+	  your platform is using the SPI bus.
 endchoice
 
-
 config WILC1000_HW_OOB_INTR
 	bool "Use out of band interrupt"
 	depends on WILC1000 && WILC1000_SDIO
@@ -53,4 +56,3 @@ config WILC1000_HW_OOB_INTR
 	---help---
 	  If your platform don't recognize SDIO IRQ, connect chipset external IRQ pin
 	  and check this option. Or, Use this to get all interrupts including SDIO interrupts.
-