CMSIS-NN: Update pdsc with arm_nn_softmax_common_s8.c (#1530)
CMSIS-NN: Update pdsc with arm_nn_softmax_common_s8.c (#1530)

Fixes #1528

Change-Id: I36d5e4c3379cbbaffe5dc1afc540d5d3862a27ae
ARM-software/CMSIS_5,ARM-software/CMSIS_5,ARM-software/CMSIS_5,ARM-software/CMSIS_5,ARM-software/CMSIS_5,ARM-software/CMSIS_5