riscv: hwprobe: Add SiFive xsfvfnrclipxfqf vendor extension

Add hwprobe for SiFive "xsfvfnrclipxfqf" vendor extension.

Signed-off-by: Cyan Yang <cyan.yang@sifive.com>
Link: https://lore.kernel.org/r/20250418053239.4351-9-cyan.yang@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

Author: cyanyang-sifive

arch/riscv/include/uapi/asm/vendor/sifive.h

@@ -2,3 +2,4 @@
 
 #define	RISCV_HWPROBE_VENDOR_EXT_XSFVQMACCDOD		(1 << 0)
 #define	RISCV_HWPROBE_VENDOR_EXT_XSFVQMACCQOQ		(1 << 1)
+#define	RISCV_HWPROBE_VENDOR_EXT_XSFVFNRCLIPXFQF		(1 << 2)

arch/riscv/kernel/vendor_extensions/sifive_hwprobe.c

@@ -16,5 +16,6 @@ void hwprobe_isa_vendor_ext_sifive_0(struct riscv_hwprobe *pair, const struct cp
 				   riscv_isa_vendor_ext_list_sifive.per_hart_isa_bitmap, {
 		VENDOR_EXT_KEY(XSFVQMACCDOD);
 		VENDOR_EXT_KEY(XSFVQMACCQOQ);
+		VENDOR_EXT_KEY(XSFVFNRCLIPXFQF);
 	});
 }