[dtc] Allow multipart property values

[Jon Loeliger]

So, like, the other day David Gibson mumbled:
> 
> There's nothing in tests/ though - I always meant to make a testsuite,
> but I never got around to it.  Current plan is to implement a
> testsuite by merging libfdt into the dtc tree.
> 
> Here's a revised patch which adds an example usage to test.dts
> 
> [dtc] Allow multipart property values
> 
> At present each property definition in a dts file must give as the
> value either a string ("abc..."), a bytestring ([12abcd...]) or a cell
> list (<1 2 3 ...>).  This patch allows a property value to be given as
> several of these, comma-separated.  The final property value is just
> the components appended together.  So a property could have a list of
> cells followed by a string, or a bytestring followed by some cells.
> Cells are always aligned, so if cells are given following a string or
> bytestring which is not a multiple of 4 bytes long, zero bytes are
> inserted to align the following cells.
> 
> The primary motivation for this feature, however, is to allow defining
> a property as a list of several strings.  This is what's needed for
> defining OF 'compatible' properties, and is less ugly and fiddly than
> using embedded \0s in the strings.
> 
> Signed-off-by: David Gibson <dwg at au1.ibm.com>

Applied.

Thanks,
jdl