Add support for "multiple": false block types

[AmandaRiu]

Fixes #1156

Related PR

gutenberg: WordPress/gutenberg#28339

Steps to test

1. Open the demo app on either android or ios. The demo already has a More block added to the post.
2. Tap + to open the block menu - notice the More block is disabled. Verify tapping the More option does not work.
3. Cancel the block menu.
4. Delete the More block in the post.
5. Tap + to open the block menu - notice the More block is now enabled. Tap to add this block to the post. Verify success.

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

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[cameronvoell]

approved via WordPress/gutenberg#28339 (review)

After the linked gutenberg PR is merged, I think we can update the reference on this PR to the merged commit on gutenberg master and this PR will be ready to go. nice work!

[AmandaRiu]

@cameronvoell Updated the gutenberg reference and reverted changes to .submodules. Ready for final review 👍

[cameronvoell]

Release notes update looks good, and great fix! 👍