wl1251: fix module names

The wl1251 move accidently renamed wl1251_sdio and wl1251_spi
modules to just sdio and spi. Restore proper module names.
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Acked-by: Kalle Valo <kvalo@adurom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl1251/Makefile

 wl1251-objs		= main.o event.o tx.o rx.o ps.o cmd.o \
 			  acx.o boot.o init.o debugfs.o io.o
+wl1251_spi-objs		+= spi.o
+wl1251_sdio-objs	+= sdio.o
 
 obj-$(CONFIG_WL1251)		+= wl1251.o
-obj-$(CONFIG_WL1251_SPI)	+= spi.o
-obj-$(CONFIG_WL1251_SDIO)	+= sdio.o
+obj-$(CONFIG_WL1251_SPI)	+= wl1251_spi.o
+obj-$(CONFIG_WL1251_SDIO)	+= wl1251_sdio.o