Disable LEC for gf12 ariane & tinyRocket and update rap/cva6 metrics

designs/rapidus2hp/cva6/rules-base.json updates:
| Metric                                        | Old      | New      | Type     |
| ------                                        | ---      | ---      | ----     |
| cts__timing__setup__tns                       |   -317.0 |   -287.0 | Tighten  |
| globalroute__timing__setup__tns               |   -526.0 |   -680.0 | Failing  |
| finish__timing__setup__tns                    |   -526.0 |   -680.0 | Failing  |

Signed-off-by: Matt Liberty <mliberty@precisioninno.com>

Author: maliberty

flow/designs/gf12/ariane/config.mk

@@ -37,3 +37,5 @@ export REMOVE_ABC_BUFFERS = 1
 
 export SWAP_ARITH_OPERATORS = 1
 export OPENROAD_HIERARCHICAL = 1
+
+export LEC_CHECK = 0

flow/designs/gf12/tinyRocket/config.mk

@@ -41,3 +41,5 @@ endif
 
 export SWAP_ARITH_OPERATORS = 1
 export OPENROAD_HIERARCHICAL = 1
+
+export LEC_CHECK = 0

flow/designs/rapidus2hp/cva6/rules-base.json

@@ -32,7 +32,7 @@
         "compare": ">="
     },
     "cts__timing__setup__tns": {
-        "value": -317.0,
+        "value": -287.0,
         "compare": ">="
     },
     "cts__timing__hold__ws": {
@@ -52,7 +52,7 @@
         "compare": ">="
     },
     "globalroute__timing__setup__tns": {
-        "value": -526.0,
+        "value": -680.0,
         "compare": ">="
     },
     "globalroute__timing__hold__ws": {
@@ -68,7 +68,7 @@
         "compare": ">="
     },
     "finish__timing__setup__tns": {
-        "value": -526.0,
+        "value": -680.0,
         "compare": ">="
     },
     "finish__timing__hold__ws": {