s5j/boot: remove unnecessary include
s5j/boot: remove unnecessary include

There is no point in including board-specific headers. Moreover, it is
not necessary to do so.

Change-Id: I3af8d9a8369d5552e4907018c8ee9d6ffacab6ee
Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

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