forked from Mirrors/opensbi

Althoug the MTIMER part of a C9xx CLINT differs from a SiFive one, the MSWI part is compliant. Add T-Head C9xx CLINT compatible string to fdt_ipi_mswi code, sharing the same codepath with SiFive CLINT. Signed-off-by: Icenowy Zheng <uwu@icenowy.me> Reviewed-by: Anup Patel <anup@brainfault.org>