ASoC: pxa: remove unused board support

Most PXA/MMP boards were removed, so the board specific ASoC
support is no longer needed, leaving only support for DT
based ones, as well as the "gumstix" and "spitz" machines
that may get converted to DT later.

Cc: Ian Molton <[email protected]>
Cc: Ken McGuire <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Liam Girdwood <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Jaroslav Kysela <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: [email protected]
Acked-by: Robert Jarzmik <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

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