cardputer-adv: Move variant.cpp -> extra_variants/variant.cpp (#10242)

Fixes issues with #includes inherited from `configuration.h` when building for pioarduino.

Aligns cardputer-adv with other variants like t_deck_pro.

variants/esp32s3/m5stack_cardputer_adv/platformio.ini

@@ -10,9 +10,6 @@ build_flags =
   -D M5STACK_CARDPUTER_ADV
   -D ARDUINO_USB_CDC_ON_BOOT=1
   -I variants/esp32s3/m5stack_cardputer_adv
-build_src_filter =
-  ${esp32s3_base.build_src_filter}
-  +<../variants/esp32s3/m5stack_cardputer_adv>
 lib_deps =
   ${esp32s3_base.lib_deps}
   # renovate: datasource=git-refs depName=meshtastic-st7789 packageName=https://github.com/meshtastic/st7789 gitBranch=main

variants/esp32s3/m5stack_cardputer_adv/variant.cpp

@@ -1,40 +0,0 @@
-#include "AudioBoard.h"
-#include "configuration.h"
-
-DriverPins PinsAudioBoardES8311;
-AudioBoard board(AudioDriverES8311, PinsAudioBoardES8311);
-
-// M5stack Cardputer ADV specific init
-
-void lateInitVariant()
-{
-    // AudioDriverLogger.begin(Serial, AudioDriverLogLevel::Debug);
-    //  I2C: function, scl, sda
-    PinsAudioBoardES8311.addI2C(PinFunction::CODEC, Wire);
-    // I2S: function, mclk, bck, ws, data_out, data_in
-    PinsAudioBoardES8311.addI2S(PinFunction::CODEC, DAC_I2S_MCLK, DAC_I2S_BCK, DAC_I2S_WS, DAC_I2S_DOUT, DAC_I2S_DIN);
-
-    // configure codec
-    CodecConfig cfg;
-    cfg.input_device = ADC_INPUT_LINE1;
-    cfg.output_device = DAC_OUTPUT_ALL;
-    cfg.i2s.bits = BIT_LENGTH_16BITS;
-    cfg.i2s.rate = RATE_44K;
-    board.begin(cfg);
-
-    // extra ES8311 init
-    auto es8311_write_reg = [](uint8_t reg, uint8_t val) {
-        Wire.beginTransmission(0x18); // ES8311 i2c address
-        Wire.write(reg);
-        Wire.write(val);
-        Wire.endTransmission();
-    };
-    es8311_write_reg(0x00, 0x80); // reset, power on
-    es8311_write_reg(0x01, 0xB5); // MCLK = BCLK
-    es8311_write_reg(0x02, 0x18); // CLOCK_MANAGER/ MULT_PRE=3
-    es8311_write_reg(0x0D, 0x01); // analog power up
-    es8311_write_reg(0x12, 0x00); // DAC power up
-    es8311_write_reg(0x13, 0x10); // enable HP drive
-    es8311_write_reg(0x32, 0xBF); // DAC volume (0dB)
-    es8311_write_reg(0x37, 0x08); // EQ bypass
-}