accel/ivpu: Add bounds checks for firmware log indices

accel/ivpu: Add bounds checks for firmware log indices

Add validation that read and write indices in the firmware log buffer
are within valid bounds (< data_size) before using them. If
out-of-bounds indices are encountered (from firmware), clamp them to
safe values instead of proceeding with invalid offsets.

This prevents potential out-of-bounds buffer access when firmware
supplies invalid log indices.

Fixes: 1fc1251149a7 ("accel/ivpu: Refactor functions in ivpu_fw_log.c")
Cc: stable@vger.kernel.org # v6.18+
Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
Reviewed-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Link: https://patch.msgid.link/20260529115842.135378-1-andrzej.kacprowski@linux.intel.com