build(deps): bump litex/deps/litedram from 20a849c to 7d8f471

Bumps [litex/deps/litedram](https://github.com/enjoy-digital/litedram) from `20a849c` to `7d8f471`.
- [Release notes](https://github.com/enjoy-digital/litedram/releases)
- [Commits](20a849c652...7d8f4713d3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
This commit is contained in:
dependabot-preview[bot] 2020-10-14 20:12:39 +00:00 committed by umarcor
parent 9e7004db50
commit f4ea118671

@ -1 +1 @@
Subproject commit 20a849c652bbbeb9857329687397e963eedac65e
Subproject commit 7d8f4713d31231aec85804d6aa6194b0c41f56ea