FmpDevicePkg: Remove useless lib mapping in dsc
FmpDevicePkg: Remove useless lib mapping in dsc

NOTE: This patch is based on thread
https://lists.01.org/pipermail/edk2-devel/2018-July/027810.html.

Cc: Michael D Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>
Reviewed-by: Michael D Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>

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