configs: am65x_hs_evm: Use FIT images when booting HS devices

HS devices use the FIT post processing step to authenticate boot images.
Set the configured boot command to load FIT by default.

Signed-off-by: Andrew F. Davis <afd@ti.com>
diff --git a/configs/am65x_hs_evm_a53_defconfig b/configs/am65x_hs_evm_a53_defconfig
index 87547ed..28c92f9 100644
--- a/configs/am65x_hs_evm_a53_defconfig
+++ b/configs/am65x_hs_evm_a53_defconfig
@@ -19,7 +19,7 @@
 CONFIG_SPL_LOAD_FIT=y
 CONFIG_SPL_FIT_IMAGE_POST_PROCESS=y
 CONFIG_OF_BOARD_SETUP=y
-CONFIG_BOOTCOMMAND="run findfdt; run envboot; run init_${boot}; run get_kern_${boot}; run get_fdt_${boot}; run get_overlay_${boot}; run run_kern"
+CONFIG_BOOTCOMMAND="run findfdt; run envboot; run init_${boot}; run get_fit_${boot}; run get_overlaystring; run run_fit"
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_SPL_TEXT_BASE=0x80080000
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y