spi25: Remove now obsolete `four_bytes_addr_funcs` path

Back port upstream `commit 7a077222566`.

BUG=chromium:478356
BRANCH=none
TEST=still builds

Change-Id: I17c69373215b5829258626d0b82043dccf68383c
Signed-off-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/1667516
Reviewed-by: Stefan Reinauer <reinauer@google.com>
4 files changed