ARM: dts: OMAP4+: Remove multimedia carveouts

The carveouts that have been reserved for multimedia usecases
are not being used currently by any driver and so have been
cleaned up. Memory will be allocated runtime through CMA for
enabling the multimedia usecases.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>