gpu: ion: Refactor common mapping functions out of system heap
The system heap contained several general purpose functions to map
buffers to the kernel and userspace. This patch refactors those
into ion_heap.c so they can be used by other heaps.
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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