Initial drop of uapi x86 headers.

Retrieved from linux-3.11.4

For x86, the generated files are:

 generated/
           asm/
               clkdev.h
               syscalls_32.h
           uapi/
                asm/
                    unistd_32.h
                    unistd_64.h
                    unistd_x32.h

Change-Id: I04d5c3e202abb9e850434c93ad3f24c931541623