mmc_select_bus_width() will try to switch to MMC_BUS_WIDTH_4 even if
MMC_CAP_4_BIT_DATA and MMC_CAP_8_BIT_DATA are not set in host->caps.
Return as soon as possible when those flags are not set
Fixes: 
		
	
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| card | ||
| core | ||
| host | ||
| Kconfig | ||
| Makefile | ||