machine conf: changing KERNEL_IMAGETYPE to zImage

Signed-off-by: Paul Butler <paul.butler@windriver.com>
renamed machine: lsisim to axm5500sim

Signed-off-by: Paul Butler <paul.butler@windriver.com>
additional updates for machine name change

Signed-off-by: Paul Butler <paul.butler@windriver.com>
replaced branch names in custom kernel recipes

Signed-off-by: Paul Butler <paul.butler@windriver.com>
corrected file name axm5500sim.inc

Signed-off-by: Paul Butler <paul.butler@windriver.com>