devtool / recipetool: use tinfoil parsing API

devtool / recipetool: use tinfoil parsing API

Use Tinfoil.parse_recipe_file() and Tinfoil.parse_recipe() instead of
the recipeutils equivalents, and replace any local duplicate
implementations. This not only tidies up the code but also allows these
calls to work in memres mode.

(From OE-Core rev: f13b56266ee96dfab65a3a7db50e8051aa9f071a)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>