e1000: fix no nvm build

Fix the following build error in case CONFIG_E1000_NO_NVM is enabled:
	  CC      drivers/net/e1000.o
	drivers/net/e1000.c: In function ‘e1000_initialize’:
	drivers/net/e1000.c:5365:5: error: ‘struct e1000_hw’ has no
		member named ‘eeprom_semaphore_present’
	make[1]: *** [drivers/net/e1000.o] Error 1
	make: *** [drivers/net] Error 2
Acked-by: Marek Vasut <marex@denx.de>