ARM: EXYNOS: Add DMC1, allow PPMU access for DMC

- Add DMC1
- Enlarge address space for DMC from 4k to 64k so that PPMU registers
  may be accessed.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>