configs/rock5b: remove unneeded uboot tools param

While switching from a custom to mainline kernel in commit
b7dbdd3d775b8e94664c6f37b11afc8a6a352e35, the uboot tools became
unneeded and were removed from the rock5b_defconfig. However, the FIT
support configuration parameter was accidentally left inside the
defconfig. This patch removes it.

Signed-off-by: Kilian Zinnecker <kilian.zinnecker@mail.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/rock5b_defconfig

@@ -40,7 +40,6 @@ BR2_TARGET_GENERIC_ISSUE="Welcome to the rock5b board"
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
 BR2_TARGET_ROOTFS_EXT2_SIZE="250M"
-BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SUPPORT=y
 BR2_PACKAGE_HOST_DOSFSTOOLS=y
 BR2_PACKAGE_HOST_DTC=y
 BR2_PACKAGE_HOST_GENIMAGE=y