arm: s5p4418: dm_serial: remove old code / add DEBUG_UART
Remove init of UART-clock and UART-reset in arch_cpu_init(). Add DEBUG_UART
to s5p4418_nanopi2_defconfig.
Signed-off-by: 
Stefan Bosch <stefan_b@posteo.net>
Remove init of UART-clock and UART-reset in arch_cpu_init(). Add DEBUG_UART
to s5p4418_nanopi2_defconfig.
Signed-off-by: Stefan Bosch <stefan_b@posteo.net>