mmc: remove duplicate mmc_get_env_dev() implementations

Since it's so trivial I could just about tolerate this when there were only
two copies of it. But now there are about to be three.
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>

drivers/mmc/mmc.c

@@ -3111,3 +3111,12 @@ int mmc_set_bkops_enable(struct mmc *mmc)
 	return 0;
 }
 #endif
+
+__weak int mmc_get_env_dev(void)
+{
+#ifdef CONFIG_SYS_MMC_ENV_DEV
+	return CONFIG_SYS_MMC_ENV_DEV;
+#else
+	return 0;
+#endif
+}

env/fat.c

@@ -29,15 +29,6 @@
 # define LOADENV
 #endif
 
-__weak int mmc_get_env_dev(void)
-{
-#ifdef CONFIG_SYS_MMC_ENV_DEV
-	return CONFIG_SYS_MMC_ENV_DEV;
-#else
-	return 0;
-#endif
-}
-
 static char *env_fat_device_and_part(void)
 {
 #ifdef CONFIG_MMC

env/mmc.c

@@ -24,11 +24,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-__weak int mmc_get_env_dev(void)
-{
-	return CONFIG_SYS_MMC_ENV_DEV;
-}
-
 #if CONFIG_IS_ENABLED(OF_CONTROL)
 static inline int mmc_offset_try_partition(const char *str, int copy, s64 *val)
 {