Instructions start from boot vector must be ARM mode.
This patch specify ARM mode explicitly and use 'bx' instruction to be
able to change to Thumb mode.
Signed-off-by: NTetsuyuki Kobayashi <koba@kmckk.co.jp>
Acked-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>