chipset_enable.c: Sync enable_flash_silvermont

Part of the upstream implementation lives in downstream
enable_flash_ich_spi() so is absent.

BUG=b:139255749, b:139258259
BRANCH=None
TEST=None

Change-Id: I9f9b15b41082d3bc6e1798b151e9ebb537a11ca0
Signed-off-by: Sam McNally <sammc@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/2355387
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
1 file changed