ARM: EXYNOS: Remove uncompress.h

Now that we can use the generic uncompres.h file, there is no need
for the machine specific header. Remove it.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>