classes/create-spdx-2.2: Fix build time dependency calculations

Build time dependencies were not being correctly calculated for SPDX
documents because while a task can `deptask` itself (as do_create_spdx
did), those dependencies do not appear in BB_TASKDEPDATA (to avoid
circular dependencies).

To fix this, an intermediate task called do_collect_sdpx_deps is created
that does the 'deptask' on do_create_spdx and records the recipe
dependencies. do_create_spdx then runs after this new task. This breaks
the circular dependency and thus all of the do_create_spdx tasks
correctly show up as dependencies of do_collect_spdx_deps.

In addition, the dependency collection logic was improved to handle the
case of transitive dependencies (that is, a dependency of a dependency)
SPDX documents missing and causing an error. These transitive
dependencies don't actually need to be included anyway since one can
follow the relationship of the direct dependency to find them. As such,
the code is reworked to find the current task in BB_TASKDEPDATA, and
then only collect the immediate dependencies of the current task.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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