opensp: upgrade to 1.5.2

opensp: upgrade to 1.5.2

Removed all patches, they've been integrated upstream. :)

Added --disable-doc-build to prevent creation of docs, which
otherwise fails with the following configure error:

could not find xmlto; set XMLTO or consider --disable-doc-build

Removed configure_prepend step that was deleting the m4/ directory,
since some macros needed for the build are defined there, and I've
not encountered any problems with keeping them there in my testing.

(From OE-Core rev: cbd055917b04bf8fc640eee289e443230de139a2)

Signed-off-by: Scott Garman <scott.a.garman@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>