build: enable subproject-based build

* Move existing phosphor-logging.wrap to the subprojects directory.
* Add wrap files for all openbmc dependencies.
* Fix up meson.build files to utilize subproje

build: enable subproject-based build

* Move existing phosphor-logging.wrap to the subprojects directory.
* Add wrap files for all openbmc dependencies.
* Fix up meson.build files to utilize subproject dependencies and follow
Meson conventions for dependency naming.
* Ensure wrap files are not ignored by .gitignore.

Tested: Built on a typical Linux development system and 'ninja test'
passed.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I167911f045ee1f27cc69bcba7be185762844a030

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