LU-9724 ldiskfs: update ext4-large-eas.patch to match upstream ext4

LU-9724 ldiskfs: update ext4-large-eas.patch to match upstream ext4

In order to match the enhanced ea_inode functionality being landed
to the upstream ext4 kernel tree, ext4-large-eas.patch is modified
to start properly initializing some of the fields we don't
currently use to minimize the interoperability issues.

In particular, the new EA inode refcount is initialized to 1, and
hash field is computed based on the xattr value as it is in the
upstream kernel patch.

However, since ext4_xattr_inode_get_hash() has not been added to
ldiskfs code so that this hash value is not used anywhere, if the
new checksum driver (sbi->s_chksum_driver) is not available, hash
value will be 0 in the current implementation, until we find a way
to calculate it based on the xattr value propely.

Signed-off-by: Emoly Liu <emoly.liu@intel.com>
Change-Id: I2bcf45c67a580f2f545816e1a70a6322c6ccc368
Reviewed-on: https://review.whamcloud.com/31033
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Yang Sheng <yang.sheng@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>