flash.h: extend struct tested with .wp field

Using "B" letter for "block protection" in TEST_* macros.

Ticket: https://ticket.coreboot.org/issues/377
Change-Id: I791400889159bc6f305fb05f3e2dd9a90dbe18a4
Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/68179
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

include/libflashrom.h

@@ -121,6 +121,7 @@ struct flashrom_flashchip_info {
 		enum flashrom_test_state read;
 		enum flashrom_test_state erase;
 		enum flashrom_test_state write;
+		enum flashrom_test_state wp;
 	} tested;
 };