boot/Kconfig: correct fdt_fixup_memory_banks name typo

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
diff --git a/boot/Kconfig b/boot/Kconfig
index b9287c6..7dd30a0 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -1699,7 +1699,7 @@
 	  memory
 
 config ARCH_FIXUP_FDT_MEMORY
-	bool "Enable arch_fixup_memory_banks() call"
+	bool "Enable fdt_fixup_memory_banks() call"
 	default y
 	help
 	  Enable FDT memory map syncup before OS boot. This feature can be