MAINTAINERS: Update maintainers/codeowners for Intel Agilex boards

Corrected/Updated proper github account names for maintainers
and codeowners file.

Signed-off-by: Girisha Dengi <girisha.dengi@intel.com>
diff --git a/CODEOWNERS b/CODEOWNERS
index 54f2b65..8872e73 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -144,7 +144,7 @@
 /boards/arm64/fvp_baser_aemv8r/           @povergoing
 /boards/arm64/fvp_base_revc_2xaemv8a/     @carlocaione
 /boards/arm64/intel_socfpga_agilex_socdk/ @siclim @ngboonkhai
-/boards/arm64/intel_socfpga_agilex5_socdk/ @chongteikheng
+/boards/arm64/intel_socfpga_agilex5_socdk/ @teikheng @gdengi
 /boards/arm64/rcar_*/                     @lorc @xakep-amatop
 # All cmake related files
 /doc/develop/tools/coccinelle.rst                @himanshujha199640 @JuliaLawall