arm: dts: k3-am64: Move to OF_UPSTREAM

Enable OF_UPSTREAM for AM64-EVM and SK-AM64 boards. Remove DT files that
are now available in dts/upstream. Update the appended files based on
version of latest OF_UPSTREAM sync point (v6.7-rc7).

Signed-off-by: Andrew Davis <afd@ti.com>
diff --git a/configs/am64x_evm_a53_defconfig b/configs/am64x_evm_a53_defconfig
index ad5472c..b7057be 100644
--- a/configs/am64x_evm_a53_defconfig
+++ b/configs/am64x_evm_a53_defconfig
@@ -16,7 +16,7 @@
 CONFIG_ENV_SIZE=0x20000
 CONFIG_DM_GPIO=y
 CONFIG_SPL_DM_SPI=y
-CONFIG_DEFAULT_DEVICE_TREE="k3-am642-evm"
+CONFIG_DEFAULT_DEVICE_TREE="ti/k3-am642-evm"
 CONFIG_SPL_TEXT_BASE=0x80080000
 CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_DM_RESET=y
@@ -74,7 +74,7 @@
 CONFIG_CMD_REGULATOR=y
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
-CONFIG_OF_LIST="k3-am642-evm k3-am642-sk"
+CONFIG_OF_LIST="ti/k3-am642-evm ti/k3-am642-sk"
 CONFIG_MULTI_DTB_FIT=y
 CONFIG_SPL_MULTI_DTB_FIT=y
 CONFIG_SPL_MULTI_DTB_FIT_NO_COMPRESSION=y
@@ -170,3 +170,4 @@
 CONFIG_USB_FUNCTION_MASS_STORAGE=y
 CONFIG_SPL_DFU=y
 CONFIG_FS_FAT_MAX_CLUSTSIZE=16384
+CONFIG_OF_UPSTREAM=y