classes/image_populate_mfgtool: init

The class provides the infrastructure for MFGTOOL generation and is tied
to images. To generate the bundle, the task populate_mfgtool must be
called. For example:

,----[ Running populate_mfgtool for core-image-minimal image ]
| $: bitbake core-image-minimal -c populate_mfgtool
`----

The class behavior is controlled through the MFGTOOLCONFIG (analogous to
PACKAGECONFIG) variable. The MFGTOOLCONFIG variable itself specifies a
space-separated list of the script to enable. Following the script, you
can determine the behavior of each script by providing up to two
order-dependent arguments, which are separated by commas. You can omit
any argument you like but must retain the separating commas. The order
is important and specifies the following:

  1. Extra dependencies that should be added to the do_populate_mfgtool
     task, if the script is enabled.
  2. Extra binaries that should be added to the bundle, if the script is
     enabled.

For example:

,----[ Defining foo.uuu.in and bar.uuu script ]
| MFGTOOLCONFIG = "foo.uuu.in bar.uuu"
| MFGTOOLCONFIG[foo.uuu.in] = "dep-foo1:do_deploy dep-foo2:do_deploy,file-foo1"
| MFGTOOLCONFIG[bar.uuu] = "dep-bar1:do_deploy,file-bar1 file-bar2"
`----

The dep-foo1:do_deploy, dep-foo2:do_deploy, and dep-bar1:do_deploy are
added to do_populate_mfgtool dependencies. In addition, file-foo1,
file-bar1, and file-bar2 are copied to the bundle, only if the script is
enabled.

During the mfgtool bundle generation, the uuu.in files are processed and
some variables replaced. The variables are:

  - MACHINE
  - UBOOT_BINARY
  - SPL_BINARY
  - IMAGE_BASENAME

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

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