The ISID field is a 6-byte field in network (big-endian) byte order.
The previous code was casting the uint8_t isid[6] value into uint64_t,
which was actually casting the address of the first byte of isid (not
the contents of the array), and it was also not correctly converting
byte order.
Change-Id: Idd114e06d30040cf28931d7da7ffdc8d6c45e82a
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>