libsnapshot: Move export_include_dirs to correct location.

Bug: 291083311
Test: builds
Change-Id: I7a547bb0b2c06f312f83a6b8659a4e30e97c8438
diff --git a/fs_mgr/libsnapshot/Android.bp b/fs_mgr/libsnapshot/Android.bp
index 9d1ce7d..8f35381 100644
--- a/fs_mgr/libsnapshot/Android.bp
+++ b/fs_mgr/libsnapshot/Android.bp
@@ -166,7 +166,6 @@
     header_libs: [
         "libupdate_engine_headers",
     ],
-    export_include_dirs: ["include"],
 }
 
 cc_library_static {
@@ -184,6 +183,7 @@
         "libsnapshot_cow/writer_base.cpp",
         "libsnapshot_cow/writer_v2.cpp",
     ],
+    export_include_dirs: ["include"],
     host_supported: true,
     recovery_available: true,
     ramdisk_available: true,