FmpDevicePkg: Add TimerLib to DSC file

FmpDevicePkg: Add TimerLib to DSC file

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1089

FmpDevicePkg use OpensslLib and when OpenSSL upgrade to 1.1.1b,
TimerLib is required by OpensslLib in CryptoPkg(commit 456dd8b99f,
CryptoPkg: Upgrade OpenSSL to 1.1.1b)

So add TimerLib to DSC file.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Xiaoyu Lu <xiaoyux.lu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>