spi_flash: move the unlock patch to bootloader and add support for GD

components/spi_flash/sim/flash_mock.cpp

@@ -75,6 +75,11 @@ extern "C" int spi_flash_get_erase_cycles(size_t sector)
     return spiflash.get_erase_cycles(sector);
 }
 
+extern "C" esp_err_t bootloader_flash_unlock(void)
+{
+    return ESP_OK;
+}
+
 esp_rom_spiflash_result_t esp_rom_spiflash_read(uint32_t target, uint32_t *dest, int32_t len)
 {
     return spiflash.read(target, dest, len);