board: sl28: fix DRAM pretty print

The current console output is:

DRAM:  4 GiB
DDR    4 GiB (DDR3, 32-bit, CL=11, ECC on)

The size is printed twice and we can save one line of console output if
we join both lines. The new output is as follows:

DRAM:  4 GiB (DDR3, 32-bit, CL=11, ECC on)

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/board/kontron/sl28/sl28.c b/board/kontron/sl28/sl28.c
index e84b356..a4ee8a1 100644
--- a/board/kontron/sl28/sl28.c
+++ b/board/kontron/sl28/sl28.c
@@ -47,8 +47,6 @@
 
 void detail_board_ddr_info(void)
 {
-	puts("\nDDR    ");
-	print_size(gd->bd->bi_dram[0].size + gd->bd->bi_dram[1].size, "");
 	print_ddr_info(0);
 }