ARM: dts: aspeed: Fix AST2600 machines line names

Tacoma and Rainier both have a line-names array that is too long:

 gpio gpiochip0: gpio-line-names is length 232 but should be at most length 208

This was probably copied from an AST2500 device tree that did have more
GPIOs on the controller.

Fixes: e9b24b55 ("ARM: dts: aspeed: rainier: Add gpio line names")
Fixes: 2f68e4e7 ("ARM: dts: aspeed: tacoma: Add gpio line names")
Link: https://lore.kernel.org/r/20210624090742.56640-1-joel@jms.id.auSigned-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts

@@ -280,10 +280,7 @@ &gpio0 {
 	/*W0-W7*/	"","","","","","","","",
 	/*X0-X7*/	"","","","","","","","",
 	/*Y0-Y7*/	"","","","","","","","",
-	/*Z0-Z7*/	"","","","","","","","",
-	/*AA0-AA7*/	"","","","","","","","",
-	/*AB0-AB7*/	"","","","","","","","",
-	/*AC0-AC7*/	"","","","","","","","";
+	/*Z0-Z7*/	"","","","","","","","";
 
 	pin_mclr_vpp {
 		gpio-hog;

arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts

@@ -136,10 +136,7 @@ &gpio0 {
 	/*W0-W7*/	"","","","","","","","",
 	/*X0-X7*/	"","","","","","","","",
 	/*Y0-Y7*/	"","","","","","","","",
-	/*Z0-Z7*/	"","","","","","","","",
-	/*AA0-AA7*/	"","","","","","","","",
-	/*AB0-AB7*/	"","","","","","","","",
-	/*AC0-AC7*/	"","","","","","","","";
+	/*Z0-Z7*/	"","","","","","","","";
 };
 
 &fmc {