lib/oe/sdk: Adds get_extra_sdk_info to reuse code in buildhistory
This function is going to be used for generating the target and host
manifest files packages for eSDK. Added some fixes for buildhistory.bblclass,
and docstring for get_extra_sdkinfo at oe.sdk
[YOCTO #9038]
Signed-off-by: Francisco Pedraza <francisco.j.pedraza.gonzalez@intel.com> Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
