drm/tests: Replace strcpy to strscpy on drm_test_framebuffer_create test

Replace the use of strcpy to strscpy on the test_to_desc of the
drm_test_framebuffer_create test for better security and reliability.

Signed-off-by: Carlos Eduardo Gallo Filho <gcarlos@disroot.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240911001559.28284-4-gcarlos@disroot.org


Signed-off-by: Maxime Ripard <mripard@kernel.org>