Vlv2TbltDevicePkg: Adjust the device priority

In BootOptionPriority(), the higher number implies the lower boot
priority. This commit lowers the priority of network booting and raises
the priority of the local devices. Besides, SD and EMMC are also added
to BootOptionPriority() since Minnowboard comes with a SD card slot.

v2:
  Also match MSG_URI_DP to sort HTTP Boot options

Cc: Zailiang Sun <zailiang.sun@intel.com>
Cc: Yi Qian <yi.qian@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>