poke: map area into client team in `POKE_MAP_MEMORY` ioctl

After this change `POKE_UNMAP_MEMORY` ioctl will became redurant and
an alias for `delete_area()`. Areas will be automatically deleted
on team exit.

Change-Id: I336b49c2281abf064e1bf28d908c7b2c5afd4df0

poke: fix setting area name in POKE_MAP_MEMORY ioctl

Fix regression caused hrev52304

Change-Id: Ibadaed3a098d33787c18f243c55c546ff8c2d03b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7099
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

poke: use phys_addr_t for mem_map_args's physical_address field

This is needed to fix usage of POKE_GET_PHYSICAL_ADDRESS on
x86 32 bits (with PAE).

Change-Id: Ic00185ec7fcf9b6666ad6169a752d8b8edd2b61b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5975
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

poke: raise IOPL on x86 when opening the driver

This should allow easier porting of things like flashrom,
as it mimics FreeBSD's /dev/io behaviour.

Change-Id: Iaa6b6342cf7983a9655a7155adfcc46c8a8264f1
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1077
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

poke: allow multiple open()

Not sure why it only ever allowed a single instance.

Change-Id: I972a1d601d93725674a97fb341aa7ffb3625b105
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1075
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

drivers/poke: Fix for GCC7 & C++11.

drivers/poke: Only allow root() to open.

This allows applications to theoretically open() the poke device but
then change their uid/euid to something more restrictive. The mem
device is not even this permissive; but I can think of some scenarios
in which this might be useful.

drivers/poke: Access the user buffers correctly.

Untested (as it seems /bin/poke was never added?) but unless I messed
up some of the memcpy arguments, this should work.

Fixes #14429.

drivers/poke: Compile as C++; some formatting cleanup.