modules: lvgl: disable for CPU_CORTEX_M0/M0PLUS

There is a compiler bug in the current Zephyr SDK (GCC 10.3.0) that
prevents using LVGL on ARM Cortex M0/M0+. Disable LVGL on such CPU until
the next SDK is deployed (GCC 12.1), as the issues does not appear
anymore.

Ref. https://github.com/lvgl/lvgl/issues/3425



Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>