msm: vidc: Split HDR info into different ext controls

HDR info has two separate information sets. Hence group them
logically instead of passing as one block.

CRs-Fixed: 2100854
Change-Id: I2493f92bfbeb8a71c22147e218706af00bc635e0
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>
Signed-off-by: Salman Syed <ssalman@codeaurora.org>