CorebootModulePkg/CbParseLib: Coding style update

CorebootModulePkg/CbParseLib: Coding style update

This patch update file CbParseLib.c to make it consistent with EDKII coding style:
1) Add function comments.
2) Add {} for if statement.
3) Compare with NULL for pointer and compare with 0 for integer instead of using them like a BOOLEAN.
4) For debug information only, use EFI_D_INFO instead of EFI_D_ERROR
5) Correct IN, OUT modifier

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Dong <guo.dong@intel.com>
Reviewed-by: Maurice Ma <maurice.ma@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17487 6f19259b-4bc3-4df7-8a09-765794883524