arm: at91/spl: mpddrc: add struct atmel_mpddrc_config

Add struct atmel_mpddrc_config to accommodate the mpddrc register
configurations, not using the mpddrc register map structure,
struct atmel_mpddrc, in order to increase readability and reduce
run-time memory use.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/board/atmel/at91sam9n12ek/at91sam9n12ek.c b/board/atmel/at91sam9n12ek/at91sam9n12ek.c
index 59bc535..0b0177d 100644
--- a/board/atmel/at91sam9n12ek/at91sam9n12ek.c
+++ b/board/atmel/at91sam9n12ek/at91sam9n12ek.c
@@ -274,7 +274,7 @@
 }
 
 #include <asm/arch/atmel_mpddrc.h>
-static void ddr2_conf(struct atmel_mpddr *ddr2)
+static void ddr2_conf(struct atmel_mpddrc_config *ddr2)
 {
 	ddr2->md = (ATMEL_MPDDRC_MD_DBW_16_BITS | ATMEL_MPDDRC_MD_DDR2_SDRAM);
 
@@ -310,7 +310,7 @@
 {
 	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
 	struct at91_matrix *matrix = (struct at91_matrix *)ATMEL_BASE_MATRIX;
-	struct atmel_mpddr ddr2;
+	struct atmel_mpddrc_config ddr2;
 	unsigned long csa;
 
 	ddr2_conf(&ddr2);