recipes-support: Remove all Xavier AGX and NX devkits related code

These devices are in progress of being released on JP5,
from a different repository: https://github.com/balena-os/balena-jetson-jp5

Signed-off-by: Alexandru Costache <alexandru@balena.io>

layers/meta-balena-jetson/recipes-support/hostapp-update-hooks/hostapp-update-hooks.bbappend

@@ -18,25 +18,6 @@ HOSTAPP_HOOKS:append:jetson-nano-2gb-devkit = " 99-resin-uboot \
                                                 99-resin-bootfiles-nano \
 "
 
-DEPENDS:append:jetson-xavier  = " tegra194-flash-dry"
-DEPENDS:append:jetson-xavier-nx-devkit-emmc  = " tegra194-nxde-flash-dry"
-DEPENDS:append:jetson-xavier-nx-devkit  = " tegra194-nxde-sdcard-flash"
-
-# Xaviers do not use u-boot, but for rollbacks to work
-# we need to update the resinOS_uEnv.txt file
-HOSTAPP_HOOKS:append:jetson-xavier  = " \
-    99-resin-uboot \
-    99-resin-bootfiles-xavier \
-"
-
-XAVIER_NX_HOOKS = " \
-    99-resin-uboot \
-    99-resin-bootfiles-xavier-nx-devkit \
-"
-
-HOSTAPP_HOOKS:append:jetson-xavier-nx-devkit-emmc  = " ${XAVIER_NX_HOOKS}"
-HOSTAPP_HOOKS:append:jetson-xavier-nx-devkit  = " ${XAVIER_NX_HOOKS}"
-
 DEPENDS:append:jetson-tx2 = " tegra186-flash-dry"
 
 HOSTAPP_HOOKS:append:jetson-tx2 = " \