riscv: hwprobe: fix invalid sign extension for RISCV_HWPROBE_EXT_ZVFHMIN

The current definition yields a negative 32bits signed value which
result in a mask with is obviously incorrect. Replace it by using a
1ULL bit shift value to obtain a single set bit mask.

Fixes: 5dadda5 ("riscv: hwprobe: export Zvfh[min] ISA extensions")
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240409143839.558784-1-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

Author: clementleger

arch/riscv/include/uapi/asm/hwprobe.h

@@ -54,7 +54,7 @@ struct riscv_hwprobe {
 #define		RISCV_HWPROBE_EXT_ZFHMIN	(1 << 28)
 #define		RISCV_HWPROBE_EXT_ZIHINTNTL	(1 << 29)
 #define		RISCV_HWPROBE_EXT_ZVFH		(1 << 30)
-#define		RISCV_HWPROBE_EXT_ZVFHMIN	(1 << 31)
+#define		RISCV_HWPROBE_EXT_ZVFHMIN	(1ULL << 31)
 #define		RISCV_HWPROBE_EXT_ZFA		(1ULL << 32)
 #define		RISCV_HWPROBE_EXT_ZTSO		(1ULL << 33)
 #define		RISCV_HWPROBE_EXT_ZACAS		(1ULL << 34)