Fixup mosys Rialto support to work in R50

This is required to make commit 5eba249 build correctly.
- k4e6e304eb_egcf support was merged into trunk as
  https://chromium-review.googlesource.com/338175 but does now
  apply to R50 cleanly due to extensive variable renaming in master
- samsung_lpddr3_k4e8e304ee_egce likewise also needs renaming in R50

BUG=chrome-os-partner:56082
TEST=R50 branch builds
BRANCH=R50

https://chromium-review.googlesource.com/338175

Change-Id: I8b48308289dfe15bc483a1a33bec825642942b67
Reviewed-on: https://chromium-review.googlesource.com/385161
Tested-by: Jonathan Dixon <joth@chromium.org>
Commit-Queue: Jonathan Dixon <joth@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
3 files changed