rockchip: px30-firefly add standalone dts

Firefly Core-PX30-JD4 use UART2M1 while PX30 evb using UART2M0, the U-Boot
proper will use the dts setting to do the IOMUX init, and a separate dts
is needed for px30-firefly.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/firefly-px30_defconfig b/configs/firefly-px30_defconfig
index 5171bf8..e24f1cf 100644
--- a/configs/firefly-px30_defconfig
+++ b/configs/firefly-px30_defconfig
@@ -20,7 +20,7 @@
 CONFIG_FIT_VERBOSE=y
 CONFIG_SPL_LOAD_FIT=y
 # CONFIG_CONSOLE_MUX is not set
-CONFIG_DEFAULT_FDT_FILE="rockchip/px30-evb.dtb"
+CONFIG_DEFAULT_FDT_FILE="rockchip/px30-firefly.dtb"
 CONFIG_MISC_INIT_R=y
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y
@@ -53,7 +53,7 @@
 CONFIG_EFI_PARTITION_ENTRIES_NUMBERS=64
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_LIVE=y
-CONFIG_DEFAULT_DEVICE_TREE="px30-evb"
+CONFIG_DEFAULT_DEVICE_TREE="px30-firefly"
 CONFIG_OF_SPL_REMOVE_PROPS="pinctrl-0 pinctrl-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y