configs/process_configs.sh: Handle config items with no help text

The current config scripts logic expects the helpnewconfig output for each item to begin with the full config item name followed by a colon. But if a config item has no help text then the helpnewconfig output does not follow this format.

Fix this by adjusting the process_configs.sh and gen_config_patches.sh awk scripts so they get the config item name from the Symbol: line which is always present in helpnewconfig output

Signed-off-by: Patrick Talbert ptalbert@redhat.com