ARM: dts: pxa2xx: fix hwuart memory range

The memory range for the hwuart is at 0x41600000, not 0x41100000.
This also solves a conflict with the MMC controller node.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>