block: export 'ro' sysfs attribute for partitions
block: export 'ro' sysfs attribute for partitions

We already export 'ro' for the disk. This adds the same attribute
for partitions.

Cc: Karel Zak <b517c2d99ca3f904174ad92ae4446c78e81c3cf1@redhat.com>
Signed-off-by: Kay Sievers <a591390dde1303c55d531fd687bfa5ffd43e435e@vrfy.org>
Signed-off-by: Jens Axboe <08e836a620179c237f631ad0545a7ebdf54201f3@fusionio.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas