Claude review: drm/radeon/cik: fix endian cik_cp_gfx_load_microcode()

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Verdict: Correct and straightforward fix.**

The variable `fw_data` is declared as `const __le32 *` at line 3900. In the new firmware header path (the `if` branch), the PFP and CE sections correctly cast to `(const __le32 *)`, but the ME section incorrectly casts to `(const __be32 *)`:

```c
/* PFP */
fw_data = (const __le32 *)    // correct
    (rdev->pfp_fw->data + ...);

/* CE */
fw_data = (const __le32 *)    // correct
    (rdev->ce_fw->data + ...);

/* ME */
fw_data = (const __be32 *)    // BUG - should be __le32
    (rdev->me_fw->data + ...);
```

This is clearly a copy-paste error from the `else` branch (lines 3934-3957), which handles legacy firmware format using `__be32`. In the new-format branch, all firmware data uses `le32_to_cpup()` for reading (line 3931), so the cast must be `__le32 *` to match.

The fix changes the cast to `(const __le32 *)`, consistent with the PFP and CE casts above it and with the `le32_to_cpup()` usage that follows. This has no runtime impact since the cast is just a pointer type annotation — the underlying data and byte-swap operations are unchanged — but it silences a legitimate sparse warning and makes the code correctly self-documenting.

**No issues found.** Reviewed-by worthy.

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