import v3.15.7.
set ABI to 7.slh.2.

* set ABI to 7.slh.2.
* add patches from the -stable queue:
  - media-staging-tighten-omap4iss-dependencies
  - media-media-v4l2-core-v4l2-dv-timings.c-cleaning-up-code-wrong-value-
    used-in-aspect-ratio
  - media-af9035-override-tuner-id-when-bad-value-set-into-eeprom
  - media-hdpvr-fix-two-audio-bugs
  - media-tda10071-force-modulation-to-qpsk-on-dvb-s
  - nfs-only-show-posix-acls-in-listxattr-if-actually-present
  - xtensa-fix-sysmem-reservation-at-the-end-of-existing-block
  - block-provide-compat-ioctl-for-blkzeroout
  - block-don-t-assume-last-put-of-shared-tags-is-for-the-host
  - libata-support-the-ata-host-which-implements-a-queue-depth-less-than-32
  - libata-introduce-ata_host-n_tags-to-avoid-oops-on-sas-controllers
NOT RELEASED YET

* NOT RELEASED YET
* set ABI to 7.slh.3.