e1000/base: allow both ULP and EEE in Sx state
e1000/base: allow both ULP and EEE in Sx state

This patch implements a modified flow that allows both ULP and EEE
in Sx (Sticky mode).

Signed-off-by: Wenzhuo Lu <58cb9036bdff9a5412edc3b9f70e105ccf59954f@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk