NetworkPkg/TlsDxe: Fix failure to process multiple TLS records.
NetworkPkg/TlsDxe: Fix failure to process multiple TLS records.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1290.

Current implementation failed to parse the multiple TLS record
messages due to the incorrect pointer of TLS record header. This
patch is to resolve that problem.

Cc: Ye Ting <fe1f30c12225d8cd094a72a37b5acbb01ee15159@intel.com>
Cc: Fu Siyuan <eef549df2036636f79f66102b4e2dc444721df8f@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Wu Jiaxin <91f509c31e98a6df13950454fe51aea543223eaa@intel.com>
Reviewed-by: Fu Siyuan <eef549df2036636f79f66102b4e2dc444721df8f@intel.com>

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