fix the issue of "Simple File System Protocol Test -> SetInfo_Conf failed on RAS_MB...

fix the issue of "Simple File System Protocol Test -> SetInfo_Conf failed on RAS_MB". When it print a string contained a control character of 0xc, it will hang on ConOut->OutputString() which will preprocessor some control character and call HiiStringToImage to render. There is gap between ConOut->OutputString() and HiiStringToImage.The former doesn't identify '0xc' as a line break character and assert only one line font printed. But the latter think it is so and print 2 line, which causes assertion.
I add EFI_HII_IGNORE_LINE_BREAK flag to force HiiStringToImage ignore the force line break character.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8736 6f19259b-4bc3-4df7-8a09-765794883524