mmc: Drop unnecessary case for mmc_probe()

Drop the unnecessary empty function case for mmc_probe().

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 5d9b541..31f65f6 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -2653,12 +2653,7 @@
 	mmc->preinit = preinit;
 }
 
-#if CONFIG_IS_ENABLED(DM_MMC) && defined(CONFIG_SPL_BUILD)
-static int mmc_probe(bd_t *bis)
-{
-	return 0;
-}
-#elif CONFIG_IS_ENABLED(DM_MMC)
+#if CONFIG_IS_ENABLED(DM_MMC)
 static int mmc_probe(bd_t *bis)
 {
 	int ret, i;