lvgl: Factor out and unify lv-drivers configuration

The configuration of lv_drivers is the same in lv-drivers and lvgl-demo-fb,
the later just pulls in its own already preconfigured variant of lv-drivers
as git submodule. Pull out the lv-drivers configuration into separate file
lv-drivers.inc, so it can be shared by lv-drivers and lvgl-demo-fb recipes.

Furthermore, as the configuration support in both recipes diverged already,
merge support for both sets of configuration options. This way, lv-drivers
grows support for DRM and SDL backend, and lvgl-demo-fb for WL backend. The
PACKAGECONFIG of each recipe is left unchanged so far to avoid breaking of
existing users.

Note that LVGL_CONFIG_USE_EVDEV is new and activated for both fbdev and drm,
since both of those backends need EVDEV support right now. The libinput input
support is not available yet.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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