configs: rzg2_beacon: Realign ENV location and offset

The ENV size and offset were changed to different
values in Beacon's downstream release.  Change them to the
same values as the downstream for consistent behavior.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/configs/rzg2_beacon_defconfig b/configs/rzg2_beacon_defconfig
index 4aabb1f..234c965 100644
--- a/configs/rzg2_beacon_defconfig
+++ b/configs/rzg2_beacon_defconfig
@@ -3,7 +3,8 @@
 CONFIG_TEXT_BASE=0x50000000
 CONFIG_SYS_MALLOC_LEN=0x4000000
 CONFIG_SYS_MALLOC_F_LEN=0x2000
-CONFIG_ENV_OFFSET=0x0
+CONFIG_ENV_SIZE=0x2000
+CONFIG_ENV_OFFSET=0xFFFFE000
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="renesas/r8a774a1-beacon-rzg2m-kit"
 CONFIG_RCAR_GEN3=y