ANDROID: GKI: block: resolve ABI diff when CONFIG_BLK_DEV_BSG is unset

If CONFIG_BLK_DEV_BSG is disabled on the vendor side, then struct
request_queue will have an ABI diff. Remove the #ifdef in the struct so
that vendors can choose whether or not to use the config.

'struct request_queue at blkdev.h:434:1' changed:¬
  type size changed from 17600 to 17920 (in bits)¬
  2 data member insertions:¬
    'bsg_job_fn* request_queue::bsg_job_fn', at offset 13952 (in bits) at blkdev.h:650:1¬
    'bsg_class_device request_queue::bsg_dev', at offset 14016 (in bits) at blkdev.h:651:1¬

Signed-off-by: Will McVicker <willmcvicker@google.com>
Bug: 152917514
Test: compile, verify ABI diff
Change-Id: Iec2e3460b717b667fcc0409cbc4ec985cfe0f69c