ARM: 7849/2: h3600: update defconfig

This updates the h3600 defconfig against the latest kernel with
some small options coming and going due to Kconfig structure,
then modernize it to:

- Configure for low latency preemptive kernel
- Configure for tickless idle
- Enable HRtimers

Tested on the iPAQ h3630.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>