arm64: dts: renesas: r8a779f0: Fix HSCIF "brg_int" clock

arm64: dts: renesas: r8a779f0: Fix HSCIF "brg_int" clock

As serial communication requires a clean clock signal, the High Speed
Serial Communication Interfaces with FIFO (HSCIF) are clocked by a clock
that is not affected by Spread Spectrum or Fractional Multiplication.

Hence change the clock input for the HSCIF Baud Rate Generator internal
clock from the S0D3_PER clock to the SASYNCPERD1 clock (which has the
same clock rate), cfr. R-Car S4-8 Hardware User's Manual rev. 0.81.

Fixes: 01a787f78bfd ("arm64: dts: renesas: r8a779f0: Add HSCIF nodes")
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20221103143440.46449-4-wsa+renesas@sang-engineering.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>