net/ixgbe/base: fix possible corruption of shadow RAM

net/ixgbe/base: fix possible corruption of shadow RAM

Currently, not all shadow RAM accesses are being done under the
protection of a semaphore, which could result in corruption.

Refactor the code so that it is possible to hold the semaphore
around ixgbe_host_interface_command by introducing an unlocked form.
This patch also eliminates the function ixgbe_read_ee_hostif_data_X550
in favor of the function ixgbe_read_ee_hostif_X550.
The new arrangement is able to get both the management interface semaphore
and the EEPROM semaphore at the same time instead of separately.

Fixes: af75078fece3 ("first public release")

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>