kernel: dma: disallow altering logical map for non-CMA allocs

DMA_ATTR_STRONGLY_ORDERED and DMA_ATTR_NO_KERNEL_MAPPING alters
the logical mapping of allocated memory. This works only for CMA
allocations where the pages are PAGE_SIZE mapped.
Disallow fallback to buddy alloc if above attrs are set.

Change-Id: I25c632d3c9179e22bc5061fd5f7e9ab6e7847322
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>