Remove delay(1) from the main

Thanks @RickKimball to point that

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/main.cpp

@@ -35,8 +35,6 @@ int main( void )
 
 	initVariant();
 
-	delay(1);
-
 #if defined(USBCON)
 	usbd_interface_init();
 #endif