drm/panel: ilitek-ili9882t: fix GPIO name in error message

This driver uses the enable-gpios property and it is confusing that the
error message refers to reset-gpios.  Use the correct name when the
enable GPIO is not found.

Fixes: e2450d32 ("drm/panel: ili9882t: Break out as separate driver")
Signed-off-by: John Keeping <jkeeping@inmusicbrands.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250217120428.3779197-1-jkeeping@inmusicbrands.com