msm8226: Update for JB MR1

Update msm8226 definition for JB MR1 bring-up:
- define TARGET_ARCH
- change BOARD_KERNEL_TAGS_ADDR to BOARD_KERNEL_TAGS_OFFSET
- change external SD card mount point to /storage/sdcard1

Change-Id: Iad6f4d5e9b13a5ef597a1418e755611aa5714ccc
diff --git a/vold.fstab b/vold.fstab
index 7bf238d..8459201 100644
--- a/vold.fstab
+++ b/vold.fstab
@@ -25,4 +25,4 @@
 # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 # IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-dev_mount sdcard /storage/sdcard0 auto /devices/msm_sdcc.2/mmc_host
+dev_mount sdcard /storage/sdcard1 auto /devices/msm_sdcc.2/mmc_host