led_context.h contains a single struct with max and min period, current
drivers that use it have hardcoded values and they set it at init.
This data is not used anywhere, and it makes very little sense to use
some SRAM for it.
Hardcode the limit for each driver and drop the struct and file.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
ac1dec0498