writeprotect, cli_classic: delete old writeprotect code

Delete writeprotect code that was previously extracted from the cros tree.

This is the first of a series of commits adding writeprotect support.
Following commits incrementally implement writeprotect operations,
culminating in writeprotect support for three example chips: GD25LQ128,
GD25Q32, and GD25Q256.

BUG=b:195381327,b:153800563
BRANCH=none
TEST=flashrom -{r,w,E}
TEST=flashrom --wp-{enable,disable,range,list,status} at end of patch series

Change-Id: I67e9b31f86465e5a8f7d3def637198671ee818a8
Signed-off-by: Nikolai Artemiev <nartemiev@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/58474
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>

s25f.c

@@ -25,7 +25,6 @@
 
 #include "chipdrivers.h"
 #include "spi.h"
-#include "writeprotect.h"
 
 /*
  * RDAR and WRAR are supported on chips which have more than one set of status