[SERIAL] fix SERIAL_M32R_PLDSIO dependencies

This patch fixes a typo in the dependencies reported by
Jean-Luc Leger <reiga@dspnet.fr.eu.org>.
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

drivers/serial/Kconfig

@@ -848,7 +848,7 @@ config SERIAL_M32R_SIO_CONSOLE
 
 config SERIAL_M32R_PLDSIO
 	bool "M32R SIO I/F on a PLD"
-	depends on SERIAL_M32R_SIO=y && (PLAT_OPSPUT || PALT_USRV || PLAT_M32700UT)
+	depends on SERIAL_M32R_SIO=y && (PLAT_OPSPUT || PLAT_USRV || PLAT_M32700UT)
 	default n
 	help
 	  Say Y here if you want to use the M32R serial controller