msm: camera: cdm: Clear IRQ before reading userdata

CDM driver read the user_data reg to inform CDM's clients
about the request status being served. If before clearing
the IRQ, the value of userdata register gets updated, then
CDM will not receive another INLINE_IRQ for the updated
userdata.
This change will make sure that another interrupt is fired
by clearing the IRQ first and reading the userdata later.

CRs-Fixed: 2581559
Change-Id: I74edf1b8439ae2f88f30b6c2fdbf9ac9f3742503
Signed-off-by: Abhilash Kumar <krabhi@codeaurora.org>