Remove the cmake/ directory

zmake now references the copy in platform/ec/zephyr

BUG=b:177609422
TEST=CQ

Change-Id: I7a2a6ac10e20d5007275e5e7d7ec6c7bbb080463
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/zephyr-chrome/+/2633887
Commit-Queue: Jack Rosenthal <[email protected]>
Commit-Queue: Simon Glass <[email protected]>
Tested-by: Jack Rosenthal <[email protected]>
Auto-Submit: Jack Rosenthal <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
16 files changed