ARM: EXYNOS: Remove file path from comment section

Many files under "arm/mach-exynos" are having file path in file
comment section which is invalid now.
So for better code maintainability let's remove them.

Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>