env: fix allow to build multiple environments

Patch fixes build error when enabling CONFIG_ENV_IS_IN_SPI_FLAS
and CONFIG_ENV_IS_IN_MMC at the same time mentioned issue in
below link:

Refer: https://lists.denx.de/pipermail/u-boot/2018-February/319565.html

build error when enabling CONFIG_ENV_IS_IN_SPI_FLASH and
CONFIG_ENV_IS_IN_MMC at the same time.
Signed-off-by: NRajesh Bhagat <rajesh.bhagat@nxp.com>
Reviewed-by: NYork Sun <york.sun@nxp.com>

include/environment.h

@@ -162,15 +162,6 @@ extern const unsigned char default_environment[];
 extern void env_reloc(void);
 #endif
 
-#ifdef CONFIG_ENV_IS_IN_MMC
-#include <mmc.h>
-
-extern int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
-# ifdef CONFIG_SYS_MMC_ENV_PART
-extern uint mmc_get_env_part(struct mmc *mmc);
-# endif
-#endif
-
 #ifndef DO_DEPS_ONLY
 
 #include <env_attr.h>

include/mmc.h

@@ -828,6 +828,9 @@ void board_mmc_power_init(void);
 int board_mmc_init(bd_t *bis);
 int cpu_mmc_init(bd_t *bis);
 int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
+# ifdef CONFIG_SYS_MMC_ENV_PART
+extern uint mmc_get_env_part(struct mmc *mmc);
+# endif
 int mmc_get_env_dev(void);
 
 /* Set block count limit because of 16 bit register limit on some hardware*/