MdePkg: Refine codes related to Dhcpv4 and Dhcpv6 configuration.
MdePkg: Refine codes related to Dhcpv4 and Dhcpv6 configuration.

v2:
*add some new arch types for PXE boot.
refine the definition of arch types for http boot

Add a new head file Dhcp.h in Mde/Include/IndustryStandard, normalize the
universal option numbers and other network number tags.

Cc: Sriram Subramanian <f612f24f610c520953254974a2afa5c29f07dc84@hpe.com>
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Cc: Ye Ting <fe1f30c12225d8cd094a72a37b5acbb01ee15159@intel.com>
Cc: Fu Siyuan <eef549df2036636f79f66102b4e2dc444721df8f@intel.com>
Cc: Wu Jiaxin <91f509c31e98a6df13950454fe51aea543223eaa@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <1ed5a37ea7f59966ee72cee136ab89437ba8fc11@intel.com>
Reviewed-by: Fu Siyuan <eef549df2036636f79f66102b4e2dc444721df8f@intel.com>

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2