ARM: at91sam9m10g45ek: add mmc environment configuration support

In this configuration the environment will save in file: uboot.env of
mmc card.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/boards.cfg b/boards.cfg
index 8b1177c..866f512 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -102,6 +102,7 @@
 Active  arm         arm926ejs      at91        atmel           at91sam9263ek       at91sam9263ek_norflash                at91sam9263ek:AT91SAM9263,SYS_USE_NORFLASH                                                                                        Stelian Pop <stelian@popies.net>
 Active  arm         arm926ejs      at91        atmel           at91sam9263ek       at91sam9263ek_norflash_boot           at91sam9263ek:AT91SAM9263,SYS_USE_BOOT_NORFLASH                                                                                   Stelian Pop <stelian@popies.net>
 Active  arm         arm926ejs      at91        atmel           at91sam9m10g45ek    at91sam9m10g45ek_nandflash            at91sam9m10g45ek:AT91SAM9M10G45,SYS_USE_NANDFLASH                                                                                 Bo Shen<voice.shen@atmel.com>
+Active  arm         arm926ejs      at91        atmel           at91sam9m10g45ek    at91sam9m10g45ek_mmc                  at91sam9m10g45ek:AT91SAM9M10G45,SYS_USE_MMC                                                                                       Bo Shen<voice.shen@atmel.com>
 Active  arm         arm926ejs      at91        atmel           at91sam9n12ek       at91sam9n12ek_mmc                     at91sam9n12ek:AT91SAM9N12,SYS_USE_MMC                                                                                             Josh Wu <josh.wu@atmel.com>
 Active  arm         arm926ejs      at91        atmel           at91sam9n12ek       at91sam9n12ek_nandflash               at91sam9n12ek:AT91SAM9N12,SYS_USE_NANDFLASH                                                                                       Josh Wu <josh.wu@atmel.com>
 Active  arm         arm926ejs      at91        atmel           at91sam9n12ek       at91sam9n12ek_spiflash                at91sam9n12ek:AT91SAM9N12,SYS_USE_SPIFLASH                                                                                        Josh Wu <josh.wu@atmel.com>