[ARM] 4949/1: magician: enable flash VPP GPIO and build in MTD, physmap-flash and JFFS2

This enables rootfs on StrataFlash if the bootloader supplies the
partition list.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>