[ARM] Fix typo in arch/arm/Kconfig.debug

It's called printch, not printchar

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 45a5709..5d3acff 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -53,7 +53,7 @@
 	bool "Kernel low-level debugging functions"
 	depends on DEBUG_KERNEL
 	help
-	  Say Y here to include definitions of printascii, printchar, printhex
+	  Say Y here to include definitions of printascii, printch, printhex
 	  in the kernel.  This is helpful if you are debugging code that
 	  executes before the console is initialized.