kconfig: use T_WORD instead of T_VARIABLE for variables

There is no grammatical ambiguity by using T_WORD for variables.
The parser can distinguish variables from symbols from the context.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

scripts/kconfig/zconf.l

@@ -109,13 +109,13 @@ n	[A-Za-z0-9_-]
 		}
 		alloc_string(yytext, yyleng);
 		yylval.string = text;
-		return T_VARIABLE;
+		return T_WORD;
 	}
 	({n}|$)+	{
 		/* this token includes at least one '$' */
 		yylval.string = expand_token(yytext, yyleng);
 		if (strlen(yylval.string))
-			return T_VARIABLE;
+			return T_WORD;
 		free(yylval.string);
 	}
 	"="	{ BEGIN(ASSIGN_VAL); return T_EQUAL; }

scripts/kconfig/zconf.y

@@ -84,7 +84,6 @@ static struct menu *current_menu, *current_entry;
 %token T_STRING
 %token T_TRISTATE
 %token T_EOL
-%token <string> T_VARIABLE
 %token <string> T_ASSIGN_VAL
 
 %left T_OR
@@ -480,7 +479,7 @@ word_opt: /* empty */			{ $$ = NULL; }
 
 /* assignment statement */
 
-assignment_stmt:  T_VARIABLE assign_op assign_val T_EOL	{ variable_add($1, $3, $2); free($1); free($3); }
+assignment_stmt:  T_WORD assign_op assign_val T_EOL	{ variable_add($1, $3, $2); free($1); free($3); }
 
 assign_op:
 	  T_EQUAL	{ $$ = VAR_RECURSIVE; }