mmc: replace CONFIG_GENERIC_MMC with CONFIG_MMC

Now CONFIG_GENERIC_MMC and CONFIG_MMC match for all defconfig.
We do not need two options for the same feature.  Deprecate the
former.

This commit was generated with the sed script 's/GENERIC_MMC/MMC/'
and manual fixup of drivers/mmc/Kconfig.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/board/pandora/pandora.c b/board/pandora/pandora.c
index b371a40..3502bbf 100644
--- a/board/pandora/pandora.c
+++ b/board/pandora/pandora.c
@@ -121,7 +121,7 @@
 	}
 }
 
-#ifdef CONFIG_GENERIC_MMC
+#ifdef CONFIG_MMC
 int board_mmc_init(bd_t *bis)
 {
 	return omap_mmc_init(0, 0, 0, -1, -1);