msm: vidc: bug fixed by adding missing "break" when getting format

Bug fixed by adding missing "break" to avoid getting
overwrited color format

CRs-Fixed: 2110380
Change-Id: I4eb0594024977f7c0640c3377166509966b576fd
Signed-off-by: Zhongbo Shi <zhongbos@codeaurora.org>