mmc: wmt-sdmmc: fix compile test default

Enabling compile testing should not enable every individual driver (we
have "allyesconfig" for that).

Fixes: 7cd8db0 ("mmc: add COMPILE_TEST to multiple drivers")
Cc: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: jhovold

drivers/mmc/host/Kconfig

@@ -950,7 +950,7 @@ config MMC_USHC
 config MMC_WMT
 	tristate "Wondermedia SD/MMC Host Controller support"
 	depends on ARCH_VT8500 || COMPILE_TEST
-	default y
+	default ARCH_VT8500
 	help
 	  This selects support for the SD/MMC Host Controller on
 	  Wondermedia WM8505/WM8650 based SoCs.