OF: base: import parse phandle functions from Linux OF API ...

This imports of_parse_phandle_with_args and of_count_phandle_with_args
from Linux OF API. The slightly different of_parse_phandles_with_args
is removed and all users are converted to reflect the API change.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

of: fix typos ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: add devicetree probing support ...

This adds code to probe devices from a devicetree. Most helper
functions are directly imported from Linux.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>