[POWERPC] 4xx: Adds decoding of 440SPE memory size to boot wrapper library

This adds a function to the bootwrapper 4xx library to decode memory
size on 440SPE processors.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

arch/powerpc/boot/cuboot-taishan.c

@@ -38,7 +38,7 @@ static void taishan_fixups(void)
 	   so we just use that code for now at least */
 	ibm440ep_fixup_clocks(sysclk, 6 * 1843200);
 
-	ibm4xx_fixup_memsize();
+	ibm4xx_sdram_fixup_memsize();
 
 	dt_fixup_mac_addresses(bd.bi_enetaddr, bd.bi_enet1addr);