Add merge_ota to otatools

Bug: 282189563
Test: manual, m otatools-package, confirm that merga_ota is
    present in otatools.zip
Change-Id: I40c3866bfb016aa1dec1c6dc2d95c66deb1e61ea
diff --git a/core/Makefile b/core/Makefile
index accb05a..8a0682a 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -5197,6 +5197,7 @@
   lz4 \
   make_f2fs \
   make_f2fs_casefold \
+  merge_ota \
   merge_target_files \
   minigzip \
   mk_combined_img \