Pull PollingComponent up from individual display drivers to Display. (#5444)

esphome/components/waveshare_epaper/display.py

@@ -148,7 +148,6 @@ async def to_code(config):
     else:
         raise NotImplementedError()
 
-    await cg.register_component(var, config)
     await display.register_display(var, config)
     await spi.register_spi_device(var, config)
 

esphome/components/waveshare_epaper/waveshare_epaper.h

@@ -7,8 +7,7 @@
 namespace esphome {
 namespace waveshare_epaper {
 
-class WaveshareEPaper : public PollingComponent,
-                        public display::DisplayBuffer,
+class WaveshareEPaper : public display::DisplayBuffer,
                         public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_LOW,
                                               spi::CLOCK_PHASE_LEADING, spi::DATA_RATE_2MHZ> {
  public: