EmbeddedPkg: Add CI YAML file

EmbeddedPkg: Add CI YAML file

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=4046

Adds EmbeddedPkg to the list of supported build packages for edk2
CI and fixes Library Class Check errors reported.

These changes allow EmbeddedPkg to pass NO-TARGET CI testing.

Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Abner Chang <abner.chang@amd.com>
Cc: Daniel Schaefer <git@danielschaefer.me>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>