qlnxev: Remove now unneeded include for opt_inet.h

Since the change [1], this is not required anymore.

This change partially reverts commit 8a84794715.

[1] 4012b63889 qlnxe: Let ether_ioctl() handle SIOCSIFADDR ioctl

Reviewed by:	kbowling
MFC after:	5 days
Differential Revision:	https://reviews.freebsd.org/D54889

sys/modules/qlnx/qlnxev/Makefile

@@ -49,7 +49,6 @@ SRCS+=ecore_vf.c
 
 SRCS+=qlnx_ioctl.c
 SRCS+=qlnx_os.c
-SRCS+=opt_inet.h
 
 SRCS+=	${LINUXKPI_GENSRCS}