Remove temporary intra condition check in cb4x4 mode

The previous refactoring CLs resolve all the potential issue
related to these two conditions. It is safe to remove them now
from the cb4x4 mode.

Change-Id: Ieeb1ca2804318c1f46b60c041538f8ca5f6ba0e7
diff --git a/av1/common/reconintra.c b/av1/common/reconintra.c
index ed43909..db44a23 100644
--- a/av1/common/reconintra.c
+++ b/av1/common/reconintra.c
@@ -268,11 +268,6 @@
 
     if (x + step < w) return 1;
 
-#if CONFIG_CB4X4
-    // TODO(jingning): This condition is overly simplified. Need some fixes.
-    return 0;
-#endif
-
     mi_row = (mi_row & MAX_MIB_MASK) >> hl;
     mi_col = (mi_col & MAX_MIB_MASK) >> wl;
 
@@ -310,11 +305,6 @@
 
     if (y + step < h) return 1;
 
-#if CONFIG_CB4X4
-    // TODO(jingning): This condition is overly simplified. Need some fixes.
-    return 0;
-#endif
-
     mi_row = (mi_row & MAX_MIB_MASK) >> hl;
     mi_col = (mi_col & MAX_MIB_MASK) >> wl;