apps/system/utils/README.md : Add prodconfig guide
apps/system/utils/README.md : Add prodconfig guide

Added the description of prodconfig like below.
prodconfig shows the status of hw configurations like swd enable/disable.

Signed-off-by: jeongchanKim <dd29dda359f9c9995ad03eb5d0e774929bcceb5c@samsung.com>

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