soc: pil: Fix wrong use of DMA_ATTR_NO_KERNEL_MAPPING

This peripheral loader uses the DMA_ATTR_NO_KERNEL_MAPPING for
dma_alloc, but when a buffer is mapped with this, then it is
not supposed to be dereferenced in kernel context. But the buffer
is deferenced in the PIL.

Fix it by removing the attribute.

Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>