linux-user/riscv: Add Ztso extension to hwprobe

This patch exposes Ztso via hwprobe in QEMU's user space emulator.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20240207122256.902627-3-christoph.muellner@vrull.eu>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

linux-user/syscall.c

@@ -8842,6 +8842,7 @@ static int do_getdents64(abi_long dirfd, abi_long arg2, abi_long count)
 #define     RISCV_HWPROBE_EXT_ZVFH          (1 << 30)
 #define     RISCV_HWPROBE_EXT_ZVFHMIN       (1 << 31)
 #define     RISCV_HWPROBE_EXT_ZFA           (1ULL << 32)
+#define     RISCV_HWPROBE_EXT_ZTSO          (1ULL << 33)
 #define     RISCV_HWPROBE_EXT_ZACAS         (1ULL << 34)
 #define     RISCV_HWPROBE_EXT_ZICOND        (1ULL << 35)
 
@@ -8956,6 +8957,8 @@ static void risc_hwprobe_fill_pairs(CPURISCVState *env,
                      RISCV_HWPROBE_EXT_ZVFHMIN : 0;
             value |= cfg->ext_zfa ?
                      RISCV_HWPROBE_EXT_ZFA : 0;
+            value |= cfg->ext_ztso ?
+                     RISCV_HWPROBE_EXT_ZTSO : 0;
             value |= cfg->ext_zacas ?
                      RISCV_HWPROBE_EXT_ZACAS : 0;
             value |= cfg->ext_zicond ?