configs: sei610: Add config file to fix userdata size

Add separate config file to handle the different eMMC size on
the sei610 board.

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/configs/sei610_defconfig b/configs/sei610_defconfig
index 89e7bd7..520a683 100644
--- a/configs/sei610_defconfig
+++ b/configs/sei610_defconfig
@@ -1,6 +1,6 @@
 CONFIG_ARM=y
 CONFIG_SYS_BOARD="sei610"
-CONFIG_SYS_CONFIG_NAME="sei510"
+CONFIG_SYS_CONFIG_NAME="sei610"
 CONFIG_ARCH_MESON=y
 CONFIG_SYS_TEXT_BASE=0x01000000
 CONFIG_MESON_G12A=y