ARC: Remove duplicate inclusion of header files

Some header files were included twice in the same file.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --cc arch/arc/kernel/kprobes.c
Simple merge

diff --cc arch/arc/kernel/setup.c
Simple merge

diff --cc arch/arc/kernel/time.c
Simple merge