flashrom.c: Make 'chip_to_probe' a param to probe_flash()

Apart from the very bespoke case of 'probe_w29ee011()'
the override 'chip_to_probe' name is a nature parameter
to 'probe_flash()'. However we can deal with w29ee011
by providing a probe specific validation function to
check if the chip can indeed be overriden.

TEST=`./flashrom -p internal --flash-name`.

Change-Id: Ifcdace07ea2135d83dea92cfa5c6bec8d7ddf05d
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/67091
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>

include/chipdrivers.h

@@ -195,6 +195,7 @@ int printlock_at49f(struct flashctx *flash);
 
 /* w29ee011.c */
 int probe_w29ee011(struct flashctx *flash);
+bool w29ee011_can_override(const char *const chip_name, const char *const override_chip);
 
 /* stm50.c */
 int erase_sector_stm50(struct flashctx *flash, unsigned int block, unsigned int blocksize);