ARM: dts: OMAP2+: Add SDMA Audio IPs bindings

Populate DMA client information for McBSP DMIC and McPDM periperhal on
OMAP2+ devices.

Signed-off-by: Sebastien Guiriec <s-guiriec@ti.com>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>