PCF8574 driver - setup not getting called

### The problem

I am using a PCF8575 with all 16 pins configured as inputs. My testing (modifying the code with inline logging statements) indicates that PCF8574Component::setup() and PCF8574GPIOPin::setup() are never getting called at startup (or ever).

The net of that is that PCF8574Component::write_gpio_() never gets called, so the pins never get a "1" written to them as is required for them to function correctly as inputs.

[TL;DR: In my circuit, the inputs are floating normally, sometimes get shorted to ground. My device is a NXP PCF8575 with the internal 100 uA current source that performs a weak pull-up function.]

The device works okay. I was able to force configuration of the pins at the end of config by hacking dump_summary(), and I see that gpio_write_() does get called in this case:

std::string PCF8574GPIOPin::dump_summary() const {
char buffer[32];
snprintf(buffer, sizeof(buffer), "%u via PCF8574", pin_);
if (pin_==15) parent_->setup();
return buffer;
}

Is there something I need to do to cause setup() to get called? Or is this a bug?

### Which version of ESPHome has the issue?

2023.4.0

### What type of installation are you using?

Docker

### Which version of Home Assistant has the issue?

Not using Home Assistant in this test

### What platform are you using?

ESP32

### Board

ESP32-DevKitC V4

### Component causing the issue

PCF8574

### Example YAML snippet

_No response_

### Anything in the logs that might be useful for us?

_No response_

### Additional information

_No response_