arch: blackfin: uapi: be sure of "_UAPI" prefix for all guard macros

For all uapi headers, need use "_UAPI" prefix for its guard macro
(which will be stripped by "scripts/headers_installer.sh").

Also be sure that all files have their guard macros.

Also be sure that all "#endif" are followed with comments, and no '\t'
for guard macro

Signed-off-by: Chen Gang <gang.chen@asianux.com>

diff --cc arch/blackfin/include/uapi/asm/byteorder.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/cachectl.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/fcntl.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/ioctls.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/poll.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/posix_types.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/sigcontext.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/siginfo.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/signal.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/stat.h
Simple merge

diff --cc arch/blackfin/include/uapi/asm/swab.h
Simple merge