msm: vidc: Fix the HDR info setting

Bit shift and mask will retain the sign. Typecasting the variable
before bit shifting gets the right id.

CRs-Fixed: 2384822
Change-Id: I2ce01d85c525bd3e1feb6034b36e7af1867580f5
Signed-off-by: Karthikeyan Periasamy <kperiasa@codeaurora.org>