Fixes: #43094
This commit introduces a function which updates Zephyr_DIR to point to
the directory of the Zephyr package being loaded.
For Zephyr 3.0 and earlier, the Zephyr_DIR might in some cases be
`Zephyr_DIR-NOTFOUND` or pointing to the Zephyr package including the
boilerplate code instead of the Zephyr package of the included
boilerplate code.
This code ensures that when a package is loaded then Zephyr_DIR will
point correctly.
This ensures that when Zephyr releases <=3.0 is loaded, then Zephyr_DIR
will point correctly, see more in #43094.
Old style Zephyr package will in some cases load boilerplate.cmake
directly so to ensure proper behavior, restrict boilerplate uses of
`find_package(Zephyr)` to not use default search path, but allow only
the current Zephyr.
Of the same reason, only print warning if Zephyr_DIR is not defined as
this indicates old style inclusion.
Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
f96ee77c7c