maintainers: change lvgl status to "odd fixes"

Due to an unexpected change in employment status and going back to
full-time linux kernel development and maintenance, I'm no longer able
to spend much time on Zephyr. :(

Change my maintainership status to "odd fixes" for lvgl. I would also
be willing to pass the torch on to anyone interested.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>