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For the current MIPS compiler __builtin___clear_cache() generates synci instruction only with -msynci option
So, add -msynci to all mips32r2 makefiles. Also add msynci to the list flags not recognized by clang.

Change-Id: I48fd6f2b0cbe80c3cd90f453ced97a2f154f7ad3
Signed-off-by: Rocky Zhang <yan@mips.com>