feat(rust-vm-memory): remove xen feature subpackage

Azure Linux targets Hyper-V/KVM, not Xen. Remove the +xen-devel
subpackage from rust-vm-memory using spec-remove-section overlays
to strip the %package, %description, and %files sections.

Verified: build succeeds and rust-vm-memory+xen-devel RPM is no
longer produced.

Author: christopherco

base/comps/components.toml

@@ -6963,7 +6963,6 @@ includes = ["**/*.comp.toml", "component-check-disablement.toml"]
 [components.rust-virtio-bindings]
 [components.rust-virtue]
 [components.rust-vm-fdt]
-[components.rust-vm-memory]
 [components.rust-vmm-sys-util]
 [components.rust-vmw_backdoor]
 [components.rust-vsprintf]

base/comps/rust-vm-memory/rust-vm-memory.comp.toml

@@ -0,0 +1,20 @@
+[components.rust-vm-memory]
+
+# Remove the +xen feature subpackage — Xen is not applicable to Azure Linux.
+[[components.rust-vm-memory.overlays]]
+description = "Remove %package +xen-devel section"
+type = "spec-remove-section"
+section = "%package"
+package = "%{name}+xen-devel"
+
+[[components.rust-vm-memory.overlays]]
+description = "Remove %description +xen-devel section"
+type = "spec-remove-section"
+section = "%description"
+package = "%{name}+xen-devel"
+
+[[components.rust-vm-memory.overlays]]
+description = "Remove %files +xen-devel section"
+type = "spec-remove-section"
+section = "%files"
+package = "%{name}+xen-devel"