copyleft_filter.bbclass: Allow to filter on name

copyleft_filter.bbclass: Allow to filter on name

The archiver uses a license based filter to provide the source code.
This patch allows to search on name based on two new variables (COPYLEFT_PN_INCLUDE,
COPYLEFT_PN_EXCLUDE). Both variables are empty by default.
The filter by name has higher priority than the license filter.

[YOCTO # 6929]

(From OE-Core rev: 04066239e9cd6a8461fb2c18e826289469ac1240)

Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>