host kernel: add CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y and dependencies (#130)

Signed-off-by: Steven Noonan <steven@edera.dev>

Author: tycho

configs/x86_64/host.config

@@ -5978,3 +5978,12 @@ CONFIG_MEMORY_HOTPLUG=y
 CONFIG_MEMORY_HOTREMOVE=y
 CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE=y
 CONFIG_HAVE_BOOTMEM_INFO_NODE=y
+
+# dom0 memory ballooning hotplug support
+CONFIG_CRASH_HOTPLUG=y
+CONFIG_CRASH_MAX_MEMORY_RANGES=8192
+CONFIG_DEV_DAX_KMEM=m
+CONFIG_MHP_DEFAULT_ONLINE_TYPE_ONLINE_AUTO=y
+CONFIG_MHP_MEMMAP_ON_MEMORY=y
+CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y
+CONFIG_XEN_MEMORY_HOTPLUG_LIMIT=512