Remove unneeded line (spi component adds it) (#3778)

esphome/components/mcp3008/__init__.py

@@ -2,7 +2,6 @@ import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome.components import spi
 from esphome.const import CONF_ID
-from esphome.core import CORE
 
 DEPENDENCIES = ["spi"]
 AUTO_LOAD = ["sensor"]
@@ -24,6 +23,3 @@ async def to_code(config):
     var = cg.new_Pvariable(config[CONF_ID])
     await cg.register_component(var, config)
     await spi.register_spi_device(var, config)
-
-    if CORE.is_esp32:
-        cg.add_library("SPI", None)