The scratch buffer and glyph buffer are allocated during probe but never
freed. Add a remove callback to free these buffers when the truetype
console device is removed.
Fixes: 159af15074f2 ("video: truetype: Add a scratch buffer to use malloc() less")
Fixes: 69d2f4ab58 ("video: truetype: Use pre-allocated buffer for glyph rendering")
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
953829e490