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enable_mmu_* has a different function name, so it is not handy in the
shared code. enable_mmu() calls an appropriate one depending on the
exception level.

Change-Id: I0657968bfcb91c32733f75f9259f550a5c35b1c3
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>