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HttpBootDxe need to stop and release the DHCP4 child when it's not used so the NBP could create new DHCP4 child and use it. Cc: Ye Ting <ting.ye@intel.com> Cc: Zhang Lubo <lubo.zhang@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com> Reviewed-by: Ye Ting <ting.ye@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18231 6f19259b-4bc3-4df7-8a09-765794883524