update README.md

added castor device to shinano.xml

Signed-off-by: Alin Jerpelea <alin.jerpelea@sonymobile.com>
update partition size

Signed-off-by: Alin Jerpelea <alin.jerpelea@sonymobile.com>
README.md: update build instructions

Signed-off-by: Alin Jerpelea <alin.jerpelea@sonymobile.com>
kernel update to commit 3294754a177e0f6c05147a294a32987dd9c9a5c9

Signed-off-by: Alin Jerpelea <alin.jerpelea@sonymobile.com>

Conflicts:
	kernel