openfirmware: Refactor console implementation following bootloader changes.

Confirmed working on sparc

Change-Id: I60bf82978ccf967e7e10611f6360cadccf22d15d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4667
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

openfirmware: adjust for 64bit

Sparcv9 runs Openboot in 64 bit mode, which means the cell size is
64bit. Use intptr_t where appropriate to make the open firmware calls
work.

Beware, some values are still 32bit, this matters for example for
of_getprop, if you get 32bits into a 64bit variables it will be in the
MSB of it (big endian only weakness...) and confuse things. See for
example in console.cpp, where the input and output handles are retrieved
as 32bit values. It seems wise to check the expected size when using
of_getprop in these cases, instead of just checking for errors.

Change-Id: Ie72ebc4afe7c6d7602a47478f0bfb6b8247004b8
Reviewed-on: https://review.haiku-os.org/c/1369
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

* Followed Ingo's suggestion and removed the now superfluous "length" correction
in ConsoleHandle::WriteAt().
* Updated license.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15581 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed src/kernel to src/system.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12359 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Followed Ingo's suggestion and removed the now superfluous "length" correction
in ConsoleHandle::WriteAt().
* Updated license.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15581 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed src/kernel to src/system.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12359 a95241bf-73f2-0310-859d-f6bbb57e9c96