build(deps): bump litex/deps/litedram from af979bb to 596615a (#400)

Bumps [litex/deps/litedram](https://github.com/enjoy-digital/litedram) from `af979bb` to `596615a`.
- [Release notes](https://github.com/enjoy-digital/litedram/releases)
- [Commits](af979bbd31...596615a238)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
This commit is contained in:
dependabot-preview[bot] 2020-12-14 10:55:12 +01:00 committed by GitHub
parent 3be475b740
commit 75d72e561d
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@ -1 +1 @@
Subproject commit af979bbd3149c1bfe617320c22b4e4759de1182d Subproject commit 596615a2386c490942528ceae9287e9865263cbc