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

esphome/components/pcd8544/display.py

@@ -39,7 +39,6 @@ CONFIG_SCHEMA = cv.All(
 async def to_code(config):
     var = cg.new_Pvariable(config[CONF_ID])
 
-    await cg.register_component(var, config)
     await display.register_display(var, config)
     await spi.register_spi_device(var, config)
 

esphome/components/pcd8544/pcd_8544.h

@@ -7,8 +7,7 @@
 namespace esphome {
 namespace pcd8544 {
 
-class PCD8544 : public PollingComponent,
-                public display::DisplayBuffer,
+class PCD8544 : public display::DisplayBuffer,
                 public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_HIGH, spi::CLOCK_PHASE_TRAILING,
                                       spi::DATA_RATE_8MHZ> {
  public: