fix: misa[M,S,U,V] wrong offset bits (#630)

Author: Kingfish404

arch/csr/misa.yaml

@@ -134,7 +134,7 @@ fields:
     definedBy: I
     reset_value: 1
   M:
-    location: 13
+    location: 12
     description: |
       Indicates support for the `M` (integer multiply/divide) extension.
 
@@ -146,7 +146,7 @@ fields:
       return implemented?(ExtensionName::M) ? 1 : 0;
     definedBy: M
   S:
-    location: 19
+    location: 18
     description: |
       Indicates support for the `S` (supervisor mode) extension.
 
@@ -158,7 +158,7 @@ fields:
       return implemented?(ExtensionName::S) ? 1 : 0;
     definedBy: S
   U:
-    location: 21
+    location: 20
     description: |
       Indicates support for the `U` (user mode) extension.
 
@@ -170,7 +170,7 @@ fields:
       return implemented?(ExtensionName::U) ? 1 : 0;
     definedBy: U
   V:
-    location: 22
+    location: 21
     description: |
       Indicates support for the `V` (vector) extension.