perf vendor events riscv: Remove leading zeroes

perf vendor events riscv: Remove leading zeroes

The EventCode field (as stored in the mhpmeventN CSRs) is actually 56
bits wide, but there is no need to keep leading zeroes in the JSON
files. Remove them to simplify review of the following change, which
regenerates the files in a way that does not include leading zeroes.

This change was performed automatically with `sed -i "s/0x0*/0x/"`.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Tested-by: Ian Rogers <irogers@google.com>
Tested-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20250213220341.3215660-3-samuel.holland@sifive.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>