BaseTools tools_def.txt: Remove -P option in GCC ASLPP_FLAGS
BaseTools tools_def.txt: Remove -P option in GCC ASLPP_FLAGS

https://bugzilla.tianocore.org/show_bug.cgi?id=227

After -P option is removed, the generated preprocessed ASL file will have
line markers. The extra information can be removed by Trim script. ASL code
can refer to the definition in C source file. This has been supported in
VS and XCODE tool chains.

Cc: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Reviewed-by: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>

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