esp32: counter: tests: remove deprecated conf file

Remove unused/deprecated conf file from counter API
test.

Signed-off-by: Glauber Maroto Ferreira <glauber.ferreira@espressif.com>
diff --git a/tests/drivers/counter/counter_basic_api/boards/esp32.conf b/tests/drivers/counter/counter_basic_api/boards/esp32.conf
deleted file mode 100644
index 26d5270..0000000
--- a/tests/drivers/counter/counter_basic_api/boards/esp32.conf
+++ /dev/null
@@ -1 +0,0 @@
-CONFIG_HEAP_MEM_POOL_SIZE=256