automation/eclair: tag guidelines D4.7, R21.18, R21.20 as clean

Update ECLAIR configuration to consider guidelines as clean
so as to avoid regressions.

Signed-off-by: Dmytro Prokopchuk <dmytro_prokopchuk1@epam.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Nicola Vetrini <nicola.vetrini@bugseng.com>

automation/eclair_analysis/ECLAIR/tagging.ecl

@@ -23,6 +23,7 @@
 "MC3A2.D1.1||
 MC3A2.D2.1||
 MC3A2.D4.1||
+MC3A2.D4.7||
 MC3A2.D4.10||
 MC3A2.D4.11||
 MC3A2.D4.14||
@@ -103,7 +104,9 @@ MC3A2.R21.10||
 MC3A2.R21.11||
 MC3A2.R21.12||
 MC3A2.R21.13||
+MC3A2.R21.18||
 MC3A2.R21.19||
+MC3A2.R21.20||
 MC3A2.R21.21||
 MC3A2.R22.1||
 MC3A2.R22.2||