drm/amdkfd: use mask to get v9 interrupt sq data bits correctly

Interrupt sq data bits were not taken properly from contextid0 and contextid1.
Use macro KFD_CONTEXT_ID_GET_SQ_INT_DATA instead.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>