arm64: dts: renesas: r8a779a0: Add HSCIF support

Define the generic parts of the HSCIF[0-3] device nodes.

Signed-off-by: Linh Phung <linh.phung.jy@renesas.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Link: https://lore.kernel.org/r/20210121110008.15894-4-wsa+renesas@sang-engineering.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>