clk/exynos5250: fix bit number for tv sysmmu clock

Change bit from 2 to 9 for tv (mixer) sysmmu clock.

Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Reviewed-by: Sachin Kamat <sachin.kamat@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Tomasz Figa <t.figa@samsung.com>