drivers: base: dma-mapping: Fix typo in dmam_alloc_non_coherent comments

The function we are wrapping is named dma_alloc_noncoherent, and
not dma_alloc_non_coherent.

Fixes: 9ac7849e ("devres: device resource management")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>