riscv/hwprobe: add zicfilp / zicfiss enumeration in hwprobe

riscv/hwprobe: add zicfilp / zicfiss enumeration in hwprobe

Add enumeration of the zicfilp and zicfiss extensions in the hwprobe syscall.

Reviewed-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Tested-by: Andreas Korb <andreas.korb@aisec.fraunhofer.de> # QEMU, custom CVA6
Tested-by: Valentin Haudiquet <valentin.haudiquet@canonical.com>
Link: https://patch.msgid.link/20251112-v5_user_cfi_series-v23-20-b55691eacf4f@rivosinc.com
[pjw@kernel.org: updated to apply; extend into RISCV_HWPROBE_KEY_IMA_EXT_1; clean patch description]
Signed-off-by: Paul Walmsley <pjw@kernel.org>