cmd/flash: Make this default y for CFI and NOR only

This command is only useful on CFI and NOR type flashes and not others.
Update the dependency so that it's not enabled by default in other
cases. This will lead to a number of platforms no longer building this
command, where it was not useful.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 5c0a7ab..58ab357 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1085,7 +1085,7 @@
 config CMD_FLASH
 	bool "flinfo, erase, protect"
 	default y
-	depends on MTD || FLASH_CFI_DRIVER || MTD_NOR_FLASH
+	depends on FLASH_CFI_DRIVER || MTD_NOR_FLASH
 	help
 	  NOR flash support.
 	    flinfo - print FLASH memory information