arm64: renesas: r8a779g3: Use $loadaddr in bootcmd on Retronix R-Car V4H Sparrow Hawk board

Avoid use of hard-coded address in boot command, instead use $loadaddr
which is the default load address. This improves consistency of the
environment on this board.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

configs/r8a779g3_sparrowhawk_defconfig

diff --git a/configs/r8a779g3_sparrowhawk_defconfig b/configs/r8a779g3_sparrowhawk_defconfig
index 9cee4d2..2d1abf6 100644
--- a/configs/r8a779g3_sparrowhawk_defconfig
+++ b/configs/r8a779g3_sparrowhawk_defconfig
@@ -18,7 +18,7 @@
 CONFIG_SYS_CBSIZE=2048
 CONFIG_BAUDRATE=921600
 CONFIG_BINMAN=y
-CONFIG_BOOTCOMMAND="tftp 0x50000000 fitImage && bootm 0x50000000"
+CONFIG_BOOTCOMMAND="tftp ${loadaddr} fitImage && bootm ${loadaddr}"
 CONFIG_DEFAULT_FDT_FILE="r8a779g3-sparrow-hawk.dtb"
 CONFIG_CMD_REMOTEPROC=y
 CONFIG_GPIO_HOG=y