CHROMIUM: WAR: misc: fastrpc: improve DSP packet tracing

During debug mode, improve the visualization of transferred data
between the DSP and the ARM cores

BUG=b:137202421
TEST=Run label_image in loop

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Abhinav Asati <asatiabhi@codeaurora.org>
(cherry picked from commit 954a19dc542c188447ec0cccbf7047602dff43e3
https://github.com/ldts/qualcomm-lt-kernel/commits/chromiumos-4.14-iommu-mmap-gw-rebased-for-next

)
Change-Id: I06b51a8d39a0129dd83120f213b84df25451ae56
Signed-off-by: Vamsi Singamsetty <vamssi@codeaurora.org>