configs: iot2050: Drop unused CONFIG_OF_LIST from defconfig

DTBs are explicitly listed in the image source file for this board, and
this list already became outdated.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
diff --git a/configs/iot2050_defconfig b/configs/iot2050_defconfig
index 4a87a33..10abb77 100644
--- a/configs/iot2050_defconfig
+++ b/configs/iot2050_defconfig
@@ -60,7 +60,6 @@
 # CONFIG_ISO_PARTITION is not set
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
-CONFIG_OF_LIST="k3-am6528-iot2050-basic k3-am6548-iot2050-advanced"
 CONFIG_SPL_MULTI_DTB_FIT=y
 CONFIG_SPL_OF_LIST="k3-am65-iot2050-spl"
 CONFIG_SPL_MULTI_DTB_FIT_NO_COMPRESSION=y