Add PXA25x based Zaurus SL-C700/750/760/860 support.

All porting work was done by TOYOKURA Atsushi, with
several minor adjustments for integration by me and nonaka@.

His SL-C700 first running NetBS

Add PXA25x based Zaurus SL-C700/750/760/860 support.

All porting work was done by TOYOKURA Atsushi, with
several minor adjustments for integration by me and nonaka@.

His SL-C700 first running NetBSD/zaurus was demonstrated on
NetBSD booth at Open Source Canference 2011 Tokyo/Fall:
http://www.NetBSD.org/gallery/events.html#opensourceconf2011-tokyofall

Note GENERIC kernel works on SL-C750/760/860 (and C1000/3x00) but for now
SL-C700 requires its own kernel with special KERNEL_BASE_PHYS address
due to zbsdmod.o loader restriction (probably caused its small 32MB RAM).

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Allow calling scoop_set_backlight() even before scoop is attached and
schedule initial values in that case as ioexp does. Suggested by nonaka@.
Now lcdctl no longer has to defer lcdctl_set_brightness

Allow calling scoop_set_backlight() even before scoop is attached and
schedule initial values in that case as ioexp does. Suggested by nonaka@.
Now lcdctl no longer has to defer lcdctl_set_brightness() by
config_finalize_register(9), which is a bit too late.
(i.e. no backlight during USB/SD probe by config_interrupt(9) in previous)

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Reorganlization zlcd(4) and ztp(4) device attachments from nonaka@:
- ztp depends on zssp so attach ztp at zssp rather than pxaip
- split LCD backlight controls from zlcd(4) into new lcdctl device

Reorganlization zlcd(4) and ztp(4) device attachments from nonaka@:
- ztp depends on zssp so attach ztp at zssp rather than pxaip
- split LCD backlight controls from zlcd(4) into new lcdctl device
to share it among forthcoming SL-C7x0 variants

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