mmc: winbond: don't build on M68K

The Winbond MMC driver fails to build on ARCH=m68k so prevent
that build config. Silences these build errors:

../drivers/mmc/host/wbsd.c: In function 'wbsd_request_end':
../drivers/mmc/host/wbsd.c:212:28: error: implicit declaration of function 'claim_dma_lock' [-Werror=implicit-function-declaration]
  212 |                 dmaflags = claim_dma_lock();
../drivers/mmc/host/wbsd.c:215:17: error: implicit declaration of function 'release_dma_lock'; did you mean 'release_task'? [-Werror=implicit-function-declaration]
  215 |                 release_dma_lock(dmaflags);

Signed-off-by: Randy Dunlap <[email protected]>
Cc: Pierre Ossman <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: rddunlap

drivers/mmc/host/Kconfig

@@ -506,7 +506,7 @@ config MMC_OMAP_HS
 
 config MMC_WBSD
 	tristate "Winbond W83L51xD SD/MMC Card Interface support"
-	depends on ISA_DMA_API
+	depends on ISA_DMA_API && !M68K
 	help
 	  This selects the Winbond(R) W83L51xD Secure digital and
 	  Multimedia card Interface.