conf: j722s: Add usbdfu tie-test-builds config

Using the new UBOOT_CONFIG flow, enable a mode where additional uboot
configurations can be built along side the main config.  In this case,
turning on USBDFU for a board for testing purposes.

Signed-off-by: Ryan Eatmon <reatmon@ti.com>

meta-ti-bsp/conf/machine/j722s-evm-k3r5.conf

@@ -5,3 +5,11 @@
 require conf/machine/include/k3r5.inc
 
 UBOOT_MACHINE = "j722s_evm_r5_defconfig"
+UBOOT_MACHINE:tie-test-builds = ""
+
+UBOOT_CONFIG = "main"
+UBOOT_CONFIG:prepend:tie-test-builds = "usbdfu "
+UBOOT_CONFIG[main] = "j722s_evm_r5_defconfig"
+UBOOT_CONFIG[usbdfu] = "j722s_evm_r5_defconfig"
+
+UBOOT_CONFIG_FRAGMENTS[usbdfu] = "am62x_r5_usbdfu.config"