rockchip/rk3399: reinitilize debug uart when resume
rockchip/rk3399: reinitilize debug uart when resume

when shutdown logic power rail, the uart register value will reset,
so need to reinitilize debug uart.

Change-Id: I48d3535c0068fd671dea6ea32e908612992faf62
Signed-off-by: Lin Huang <c9fe3c0450a180d111405ace687410d20d0d0895@rock-chips.com>
Signed-off-by: Caesar Wang <6a97ab1d8fae3a62719c8e695586fe709398a94a@rock-chips.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,lsigithub/arm-trusted-firmware_public