hdaudio specification that the maximum BDL is 4K.

[Lsiyu7]

The kernel allocates bdl.bytes = 16K Bytes to hdaudio.
However, the hdaudio specification that the maximum BDL is 256*16=4K Bytes.

Signed-off-by: siyuli [email protected]
Signed-off-by: jasontao [email protected]
Change-Id: Ief9a58e29ec73540da4d05e0fa79bf75e0f0da6f

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