feat(plat/mediatek/apu): setup mt8192 APU_S_S_4 and APU_S_S_5 permission
feat(plat/mediatek/apu): setup mt8192 APU_S_S_4 and APU_S_S_5 permission

Setup APU_S_S_4/APU_S_S_5 permission as SEC_RW_ONLY.

Signed-off-by: Flora Fu <82aef11319778b52f9463794de9f62d1013b9601@mediatek.com>
Change-Id: I6c50b2913bf34270a1b0ffaf0e0c435fee192a4c

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware