modules: lvgl: initialize lvgl_heap_init from lvgl_init

Call lvgl_heap_init from lvgl_init rather than using two separate
SYS_INIT, this sensures that the heap is initialized correctly
regardless of the relation between CONFIG_KERNEL_INIT_PRIORITY_DEFAULT
and CONFIG_APPLICATION_INIT_PRIORITY.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
3 files changed