[NET, HAL] K64F - update files to use address of peripheral (not instance)

hal enet - asserts commented out as they are not valid for new MCU headers (address, no instance). This was done only in the KSDK enet layer which will be eventually replaced by enet from KSDK v1.0.
net - KSDK hal - first function argument is an address not an instance

Please wait with the merge until the tests are executed.. I run them locally, all client tests timeouted, same for lib v89.
yes, enet driver + hal is from the older version - enet needs to be updated to the newer one, which will happen later.