arm: mach-k3: am62: Enable OF_SYSTEM_SETUP for all boards

The fixups provided by ft_system_setup() are applicable for all AM62 based
boards. Select this at the target selection level for all AM62 boards and
remove it from any specific defconfig.

Signed-off-by: Andrew Davis <afd@ti.com>
diff --git a/arch/arm/mach-k3/am62x/Kconfig b/arch/arm/mach-k3/am62x/Kconfig
index 935d596..7c9bac2 100644
--- a/arch/arm/mach-k3/am62x/Kconfig
+++ b/arch/arm/mach-k3/am62x/Kconfig
@@ -13,6 +13,7 @@
 	bool "TI K3 based AM625 EVM running on A53"
 	select ARM64
 	select BINMAN
+	select OF_SYSTEM_SETUP
 
 config TARGET_AM625_R5_EVM
 	bool "TI K3 based AM625 EVM running on R5"
@@ -29,6 +30,7 @@
 	bool "PHYTEC phyCORE-AM62x running on A53"
 	select ARM64
 	select BINMAN
+	select OF_SYSTEM_SETUP
 
 config TARGET_PHYCORE_AM62X_R5
 	bool "PHYTEC phyCORE-AM62x running on R5"
@@ -45,6 +47,7 @@
 	bool "Toradex Verdin AM62 running on A53"
 	select ARM64
 	select BINMAN
+	select OF_SYSTEM_SETUP
 
 config TARGET_VERDIN_AM62_R5
 	bool "Toradex Verdin AM62 running on R5"
diff --git a/configs/verdin-am62_a53_defconfig b/configs/verdin-am62_a53_defconfig
index 2003a53..902c437 100644
--- a/configs/verdin-am62_a53_defconfig
+++ b/configs/verdin-am62_a53_defconfig
@@ -37,7 +37,6 @@
 CONFIG_SYS_BOOTM_LEN=0x40000000
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_BOOTDELAY=1
-CONFIG_OF_SYSTEM_SETUP=y
 CONFIG_USE_PREBOOT=y
 CONFIG_PREBOOT="test -n ${fdtfile} || setenv fdtfile k3-am625-verdin-${variant}-${fdt_board}.dtb"
 CONFIG_LOG=y