Revert "linux_spi.c: remove sysfs walker for finding spi devices"

This reverts commit f5d4071616c0e18cf2a566b4083c9270936c8858 and
ac7ed8b70847d8a98d4d1a5991fa998d54ec9eae.

BUG=b:166444077
TEST=built and ran on a nyan blaze
BRANCH=release-R85-13310.B

Change-Id: Ibbcc3717334b81fb83950f5545d1a0b1892dd03f
Signed-off-by: Kevin Shelton <kmshelton@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/2381270
Reviewed-by: Nikolai Artemiev <nartemiev@google.com>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Tested-by: Nikolai Artemiev <nartemiev@google.com>
1 file changed