linux-user/riscv: Add Zicboz block size to hwprobe

linux-user/riscv: Add Zicboz block size to hwprobe

Support for probing the Zicboz block size landed in Linux 6.6, which was
released a few weeks ago.  This provides the user-configured block size
when Zicboz is enabled.

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20231110173716.24423-1-palmer@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
(cherry picked from commit 301c65f49f9602f39b9f3ce0ad9ff70d4bda7226)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(Mjt: fixup linux-user/syscall.c to before v8.1.0-2602-ge57039ddab
 "target/riscv: rename ext_icboz to ext_zicboz")