env: Kconfig: Add default option for PHY_CORTINA

Add PHY_CORTINA as default option in SYS_MMC_ENV_DEV Kconfig entry as
PHY_CORTINA require SYS_MMC_ENV_DEV value similar to FMAN_ENET or QE.
This helps in resolving compilation failure.

Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/env/Kconfig b/env/Kconfig
index 67ff172..c0dff1f 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -616,7 +616,7 @@
 config SYS_MMC_ENV_DEV
 	int "mmc device number"
 	depends on ENV_IS_IN_MMC || ENV_IS_IN_FAT || SYS_LS_PPA_FW_IN_MMC || \
-		CMD_MVEBU_BUBT || FMAN_ENET || QE
+		CMD_MVEBU_BUBT || FMAN_ENET || QE || PHY_CORTINA
 	default 0
 	help
 	  MMC device number on the platform where the environment is stored.