s5j: assume CONFIG_ARCH_LOWVECTORS=n always
s5j: assume CONFIG_ARCH_LOWVECTORS=n always

S5J always uses the high vector. So, we do not need to consider the case
of CONFIG_ARCH_LOWVECTORS=y. This commit removes unnecessary codes for
it.

Change-Id: If48c987f82c372a32a8b03103d9a042e020848bf
Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

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