Upgrade to android13-5.15 kernel

... in preparation for the migration to android14-5.15 kernel.

In addition, drop the version suffix from the module names to make
version upgrade less intrusive.

Bug: 233317671
Test: watch TH
Change-Id: Id1fe79c848c5ecb9c3ff5c0ba2c2527e7d907d0e
diff --git a/apex/Android.bp b/apex/Android.bp
index 0f30c67..4698088 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -4,9 +4,9 @@
 
 microdroid_filesystem_images = [
     "microdroid_super",
-    "microdroid_boot-5.10",
+    "microdroid_boot",
     "microdroid_init_boot",
-    "microdroid_vendor_boot-5.10",
+    "microdroid_vendor_boot",
     "microdroid_vbmeta",
     "microdroid_vbmeta_bootconfig",
 ]