kernel: backport ubiblock support from 3.15

Backport ubiblock support from kernel 3.15 as well as all follow-up
fixes related to ubiblock.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

 create mode 100644 target/linux/generic/patches-3.14/040-UBI-R-O-block-driver-on-top-of-UBI-volumes.patch
 create mode 100644 target/linux/generic/patches-3.14/041-UBI-block-do-not-use-term-attach.patch
 create mode 100644 target/linux/generic/patches-3.14/042-UBI-block-Mark-init-only-symbol-as-__initdata.patch
 create mode 100644 target/linux/generic/patches-3.14/043-UBI-block-Use-u64-for-the-64-bit-dividend.patch
 create mode 100644 target/linux/generic/patches-3.14/044-UBI-rename-block-device-ioctls.patch
 create mode 100644 target/linux/generic/patches-3.14/045-UBI-block-Remove-__initdata-from-ubiblock_param_ops.patch
 create mode 100644 target/linux/generic/patches-3.14/046-UBI-avoid-workqueue-format-string-leak.patch
 create mode 100644 target/linux/generic/patches-3.14/047-UBI-make-UBI_IOCVOLCRBLK-take-a-parameter-for-future.patch

SVN-Revision: 41118