ARM: dts: fix PL330 MDMA1 address in DT for Universal C210 board

Revision 0 of Exynos4210 SoC (used on Universal C210 board) requires
'secure' PL330 MDMA1 address (0x12840000) instead of 'non-secure' one
(0x12850000). Fix it by overriding the default PL330 MDMA1 address in
exynos4210-universal_c210.dts.

This is a Device Tree (DT) version of commit 91280e75 ("ARM: EXYNOS:
PL330 MDMA1 fix for revision 0 of Exynos4210 SOC") and fixes recent
regression caused by conversion to DT-only setup on ARM EXYNOS.

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>