sunxi: dram: Un-inline dram helper functions

Move the dram helper functions to a separate C file, rather then having them
as inline helpers in dram.h. This saves 144 bytes in the .text segment for
sun6i builds.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/armv7/sunxi/Makefile b/arch/arm/cpu/armv7/sunxi/Makefile
index 48db744..a790a23 100644
--- a/arch/arm/cpu/armv7/sunxi/Makefile
+++ b/arch/arm/cpu/armv7/sunxi/Makefile
@@ -11,6 +11,7 @@
 obj-y	+= board.o
 obj-y	+= clock.o
 obj-y	+= cpu_info.o
+obj-y	+= dram_helpers.o
 obj-y	+= pinmux.o
 obj-y	+= usbc.o
 obj-$(CONFIG_MACH_SUN6I)	+= prcm.o