Add aliases with "serialN = &uartN;" of uart0/1 on QCA955x SoCs to
qca955x.dtsi, to enable uart1 on Linux Kernel.
without this:
[ 0.342915] ar933x-uart 18500000.uart: unable to get alias id, err=-19
Additionally, remove "serial0 = &uart;" alias from QCA955x device
dts/dtsi files.
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>