ARM: EXYNOS: Remove platform device initialization

This patch removes legacy platform device initialization code that was
used to set names and other parameters of static platform devices when
booting with ATAGS, which is not supported on Exynos any more.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>