meson: add option for use_vpd_file_cache

This flag will get toggled by ebuild based on the vpd_file_cache USE
flag.

BUG=b:77594752
TEST=compiles

Change-Id: Ice5c20a4dd8bd4d00ff6ecf7bec2e369d5f1fb22
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mosys/+/2487254
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
2 files changed