create-spdx-2.2: support to override the version of a package in SPDX 2

create-spdx-2.2: support to override the version of a package in SPDX 2

By default, still use ${PV} as the the version of a package in SPDX 2

$ echo 'INHERIT:remove = "create-spdx"' >> conf/local.conf
$ echo 'INHERIT += "create-spdx-2.2"' >> conf/local.conf
$ bitbake acl
$ jq . tmp/deploy/spdx/2.2/core2-64/recipes/recipe-acl.spdx.json
...
      "name": "acl",
      "summary": "Utilities for managing POSIX Access Control Lists",
      "supplier": "Organization: OpenEmbedded ()",
      "versionInfo": "2.3.2"
    },
...

Support to override it by setting SPDX_PACKAGE_VERSION, such as
set SPDX_PACKAGE_VERSION = "${EXTENDPKGV}" in local.conf to append
PR to versionInfo in SBOM 2
$ echo 'SPDX_PACKAGE_VERSION = "${EXTENDPKGV}"' >> conf/local.conf
$ bitbake acl
$ jq . tmp/deploy/spdx/2.2/core2-64/recipes/recipe-acl.spdx.json
...
      "name": "acl",
      "summary": "Utilities for managing POSIX Access Control Lists",
      "supplier": "Organization: OpenEmbedded ()",
      "versionInfo": "2.3.2-r0"
    },
...

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>