dma-buf: heaps: Remove heap-helpers code

The heap-helpers code was not as generic as initially hoped
and it is now not being used, so remove it from the tree.

Cc: Sumit Semwal <[email protected]>
Cc: Liam Mark <[email protected]>
Cc: Laura Abbott <[email protected]>
Cc: Brian Starkey <[email protected]>
Cc: Hridya Valsaraju <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Sandeep Patil <[email protected]>
Cc: Daniel Mentz <[email protected]>
Cc: Chris Goldsworthy <[email protected]>
Cc: Ørjan Eide <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Ezequiel Garcia <[email protected]>
Cc: Simon Ser <[email protected]>
Cc: James Jones <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Brian Starkey <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Sumit Semwal <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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