serial: sh-sci: Update rx_trigger size for RZ/T2H RSCI
The RZ/T2H RSCI has 16-stage FIFO. Like other SoCs, set the default
rx_trigger as the fifosize.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://patch.msgid.link/20251129164325.209213-3-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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