video: drop code for ARCH_SHARK in cyber2000fb

The Cyber2000 frame buffer driver contains a block of code solely
for the Shark machine. As the machine is deleted, delete this
code as well.

Also remove the pointless #ifdef CONFIG_PCI as the Kconfig
clearly states PCI as a dependency anyway.

Cc: Russell King <linux@arm.linux.org.uk>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>