SignedCapsulePkg/IniParsingLib: Update struct name
1. Change _SECTION_ITEM to _INI_SECTION_ITEM
2. Change _COMMENT_LINE to _INI_COMMENT_LINE
Because _SECTION_ITEM and _COMMENT_LINE are duplicated with
the one defined in IntelFrameworkModulePkg\Universal\
FirmwareVolume\UpdateDriverDxe\UpdateDriver.h
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Dandan Bi <dandan.bi@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>