Remove unused microdroid kernel module build rules

Unused since aosp/2274146

Test: build
Change-Id: Ifc9dc7ab6f221f331100c389606e1ebef1c56158
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 2ee03a0..c3e2692 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -305,21 +305,6 @@
     avb_private_key: ":microdroid_sign_key",
 }
 
-// TODO(b/231117670) remove this when VirtualizationTestCases moves to the
-// microdroid kernel
-prebuilt_kernel_modules {
-    name: "microdroid_kernel_modules",
-    arch: {
-        arm64: {
-            srcs: [":virt_device_prebuilts_kernel_modules_microdroid-5.15-arm64"],
-        },
-        x86_64: {
-            srcs: [":virt_device_prebuilts_kernel_modules_microdroid-5.15-x86_64"],
-        },
-    },
-    kernel_version: "5.15",
-}
-
 android_filesystem {
     name: "microdroid_vendor_ramdisk",
     deps: [