ci: enable CONFIG_DMA_RESTRICTED_POOL on 6.1 aarch64 guest kernels

This is needed for the guest to correctly parse the restricted-memory
nodes that firecracker now puts into FDT.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

resources/guest_configs/ci.config

@@ -5,6 +5,7 @@ CONFIG_SQUASHFS_ZSTD=y
 # aarch64 only TBD split into a separate file
 CONFIG_DEVMEM=y
 # CONFIG_ARM64_ERRATUM_3194386 is not set
+CONFIG_DMA_RESTRICTED_POOL=y
 # Needed for CTRL+ALT+DEL support
 CONFIG_SERIO=y
 CONFIG_SERIO_I8042=y