s390/Kconfig: add z13s and z14 ZR1 to TUNE descriptions

The names for the z13s and z14 ZR1 machines are missing for the
TUNE_Z13 and TUNE_Z14 descriptions. Just add them.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/Kconfig

@@ -396,11 +396,11 @@ config TUNE_ZEC12
 	depends on $(cc-option,-mtune=zEC12)
 
 config TUNE_Z13
-	bool "IBM z13"
+	bool "IBM z13s and z13"
 	depends on $(cc-option,-mtune=z13)
 
 config TUNE_Z14
-	bool "IBM z14"
+	bool "IBM z14 ZR1 and z14"
 	depends on $(cc-option,-mtune=z14)
 
 config TUNE_Z15