IVGCVSW-3697 Add utility function to get ArgMinMaxFunction as string
IVGCVSW-3697 Add utility function to get ArgMinMaxFunction as string

 * Allow logging of ConvertArgMinMax calls with specified Min/Max function
   which take place in HalPolicy

Signed-off-by: Francis Murtagh <e59f6df1240b2b6c2b05aa682b1b9d01b9505720@arm.com>
Change-Id: Ic8c38106725023c864f7950dc9d0e2737485cfef

ARM-software/armnn,ARM-software/armnn,ARM-software/armnn