ichspi,ich_descriptors: Sync read_ich_descriptors_via_fdo() signature

Converge to the upstream implementation in `commit d54e4f46`
by matching the function signature of 'read_ich_descriptors_via_fdo()'.

BUG=b:156870835
BRANCH=none
TEST=none

Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Change-Id: I97269172ecc3e6d1232864d3c90304869a2291bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/2206514
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
Auto-Submit: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
3 files changed