pcmcia: fix cisinfo_t removal

The cisinfo_t removal patch (c5081d5f
pcmcia: simplify pccard_validate_cis ) introduced a bug that prevented
card detection, for the (info->Chains == MAX_TUPLES) check was replaced
by (count), which is always true. Restoring the comparison to MAX_TUPLES
makes everybody happy...

[linux@dominikbrodowski.net: update changelog comment]
Signed-off-by: Marc Zyngier <marc.zyngier@altran.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>