configs: am62ax_evm_a53_defconfig: enable USB DFU support

The config fragment "am62x_a53_usbdfu.config" which adds USB DFU support
for AM62x SoC is applicable to the AM62Ax SoC as well. Hence, include it
in "am62ax_evm_a53_defconfig" in order to enable support for USB DFU flash
and boot.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
diff --git a/configs/am62ax_evm_a53_defconfig b/configs/am62ax_evm_a53_defconfig
index ad448fe..3063e7f 100644
--- a/configs/am62ax_evm_a53_defconfig
+++ b/configs/am62ax_evm_a53_defconfig
@@ -108,3 +108,5 @@
 CONFIG_SPL_SYSRESET=y
 CONFIG_SYSRESET_TI_SCI=y
 CONFIG_FS_FAT_MAX_CLUSTSIZE=16384
+
+#include <configs/am62x_a53_usbdfu.config>