populate_sdk_base: provide options to set sdk type

populate_sdk_base: provide options to set sdk type

Current sdk type is tar.xz, but for mingw sdk, since we
have symlink under the sdk folder, 7zip which used to
extract tar.xz cannot handle it, refer 7zip upstream bug:
https://sourceforge.net/p/sevenzip/discussion/45797/thread/c71d6b96/
so add option for usr can select the sdk type.

Add override SDK_ARCHIVE_TYPE, default type is tar.xz, and also
support type zip. user want to use zip type can set SDK_ARCHIVE_TYPE
to zip.

(From OE-Core rev: 57a33048a89a422cfdc986d3489c67b2d297e1e7)

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>