drm_hwcomposer: Enable readability-avoid-unconditional-preprocessor-if

Enabling this check doesn't require changes in the code.

Change-Id: I190f8af9cca51bac9fc624501eac8a2bcb3e0637
Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
diff --git a/.ci/Makefile b/.ci/Makefile
index fba46b8..db22656 100644
--- a/.ci/Makefile
+++ b/.ci/Makefile
@@ -54,7 +54,6 @@
     -cppcoreguidelines-avoid-const-or-ref-data-members  \
     -cert-err33-c                                       \
     -readability-math-missing-parentheses               \
-    -readability-avoid-unconditional-preprocessor-if    \
 
 TIDY_CHECKS_NORMAL :=                                   \
     $(TIDY_CHECKS_FINE)                                 \