arm64: dts: Add SC9863A clock nodes

add clock devicetree nodes for SC9863A.

Link: https://lore.kernel.org/r/20200414101636.24503-2-zhang.lyra@gmail.com


Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>