build system: strip quotes from CONFIG_CBFS_PREFIX in a single location

Instead of having to remember to strip the quotes everywhere so that
string comparisons (of which there are a few) match up, do it right at
the beginning.

Fixes building the image with a .config where CONFIG_CBFS_PREFIX
contains quotes.

Change-Id: I4d63341cd9f0bc5e313883ef7b5ca6486190c124
Signed-off-by: Patrick Georgi <>
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <>
Reviewed-by: Martin Roth <>
Reviewed-by: Timothy Pearson <>
2 files changed