ARM: dts: add bandwidth limit per pipe

This property can be used to set a bandwidth limit per pipe;
If the limit is set and pipe exceeds this limit, the driver
will avoid this configuration and therefore avoid underruns.

Change-Id: Ibb2b75ab5110158d9be9ea3fd1e7ae6232e5ca71
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>