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/ti/beagle/beagle.c b/board/ti/beagle/beagle.c
index e90fe1a..dc38a80 100644
--- a/board/ti/beagle/beagle.c
+++ b/board/ti/beagle/beagle.c
@@ -524,14 +524,14 @@
 	MUX_BEAGLE();
 }
 
-#if defined(CONFIG_GENERIC_MMC)
+#if defined(CONFIG_MMC)
 int board_mmc_init(bd_t *bis)
 {
 	return omap_mmc_init(0, 0, 0, -1, -1);
 }
 #endif
 
-#if defined(CONFIG_GENERIC_MMC)
+#if defined(CONFIG_MMC)
 void board_mmc_power_init(void)
 {
 	twl4030_power_mmc_init(0);