configs/freescale_imx6qsabresd: U-Boot needs host-dtc

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/55306821

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit b732fed265203a6c112007982c1ea601892f900f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/freescale_imx6qsabresd_defconfig

@@ -40,3 +40,4 @@ BR2_TARGET_UBOOT_FORMAT_IMX=y
 BR2_TARGET_UBOOT_CUSTOM_GIT=y
 BR2_TARGET_UBOOT_CUSTOM_REPO_URL="https://source.codeaurora.org/external/imx/uboot-imx.git"
 BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="rel_imx_4.9.x_1.0.0_ga"
+BR2_TARGET_UBOOT_NEEDS_DTC=y