board: amlogic: odroid-n2: fix fdtfile suffix for n2-plus

The N2+ dtb is meson-g12b-odroid-n2-plus.dtb, not n2_plus, so
correct the suffix provided in the board file. Also align the
board ident string shown during boot to match.

Fixes: 8bc780106c13 ("board: amlogic: odroid: add runtime detection of the N2/N2+/C4/HC4 variants")
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/configs/odroid-n2_defconfig b/configs/odroid-n2_defconfig
index bac44b6..1f718a3 100644
--- a/configs/odroid-n2_defconfig
+++ b/configs/odroid-n2_defconfig
@@ -9,7 +9,7 @@
 CONFIG_MESON_G12A=y
 CONFIG_DEBUG_UART_BASE=0xff803000
 CONFIG_DEBUG_UART_CLOCK=24000000
-CONFIG_IDENT_STRING=" odroid-n2/n2_plus"
+CONFIG_IDENT_STRING=" odroid-n2/n2-plus"
 CONFIG_DEBUG_UART=y
 CONFIG_OF_BOARD_SETUP=y
 # CONFIG_DISPLAY_CPUINFO is not set