[ARM] pxa: magician_defconfig enable hx4700, asic3 and w100fb

I'm not going to maintain separate defconfigs for magician and hx4700.
This should probably be renamed to htcpxa_defconfig.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>