Ensure mrc_tx is not enabled with incompatible experiments

Mrc_tx is currently not working with lv_map, supertx and
coef_interleave and requires var_tx.

Change-Id: I6e9d7a54ed10a7a4e5c2088d5907ac8dc610a474

configure

@@ -541,8 +541,12 @@ post_process_cmdline() {
     enabled pvq && disable_feature highbitdepth
     enabled pvq && disable_feature lgt
     enabled pvq && disable_feature mrc_tx
+    enabled lv_map && disable_feature mrc_tx
+    enabled supertx && disable_feature mrc_tx
+    enabled coef_interleave && disable_feature mrc_tx
     enabled pvq && disable_feature palette_throughput
     enabled mrc_tx && enable_feature ext_tx
+    enabled mrc_tx && enable_feature var_tx
     enabled ext_delta_q && soft_enable delta_q
     enabled txk_sel && soft_enable lv_map
     enabled compound_round && soft_enable convolve_round