Change return type ( const char -> char )

Change return type ( const char -> char )

 iniparser_getsecname, iniparser_getseckeys apis return type
changed "const char" to "char" for backword comppatibility issue.

[Model] ALL
[BinType] AP
[Customer] OPEN

[Issue#] N/A
[Request] N/A
[Occurrence Version] N/A

[Problem] backword comppatibility
[Cause & Measure] backword comppatibility
[Checking Method] N/A

[Team] Open Source Management and Setting Part
[Developer] dh0128.kwak
[Solution company] Samsung
[Change Type] N/A

Change-Id: I76d1bf40cd7f449fb1ac6dadaa304303cddbc6fb