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/samsung/common/misc.c b/board/samsung/common/misc.c
index 203136f..dc4dead 100644
--- a/board/samsung/common/misc.c
+++ b/board/samsung/common/misc.c
@@ -208,7 +208,7 @@
 
 static void display_board_info(void)
 {
-#ifdef CONFIG_GENERIC_MMC
+#ifdef CONFIG_MMC
 	struct mmc *mmc = find_mmc_device(0);
 #endif
 	vidinfo_t *vid = &panel_info;
@@ -226,7 +226,7 @@
 	lcd_printf("\tDRAM banks: %u\n", CONFIG_NR_DRAM_BANKS);
 	lcd_printf("\tDRAM size: %u MB\n", gd->ram_size / SZ_1M);
 
-#ifdef CONFIG_GENERIC_MMC
+#ifdef CONFIG_MMC
 	if (mmc) {
 		if (!mmc->capacity)
 			mmc_init(mmc);