Constify struct cfattach.

ok visa@ a long time ago, ok patrick@

remove uneeded includes in md armv7 files

based on include-what-you-use suggestions

Only set cpuresetfn if it isn't set already such that other reboot mechanisms
(like psci or syscon) are preferred over letting the watchdog fire.

ok patrick@

Convert a few exynos drivers to attach using the FDT.

Rename struct fdt_memory to fdt_reg to match the member name
used in the fdt attach args and the device tree.

ok kettenis@

New FDT-enabled busses will use a new "fdt" attribute. Unfortunately
this attribute is currently already defined. This define is only used
to disable the unused FDT functionality in the exynos and

New FDT-enabled busses will use a new "fdt" attribute. Unfortunately
this attribute is currently already defined. This define is only used
to disable the unused FDT functionality in the exynos and virtio code.
As the FDT code will be developed in a different manner than the way
those drivers are written today and the functionality has never been
enabled, simply remove the attribute and its users.

ok jsg@

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make the exynos code compile without fdt
ok bmercer@

Import the exynos work into tree. This is from Bitrig. Discussed with and OK jsg, also OK from krw.