linux-phytec-ti

ARM: shmobile: Remove obsolete zboot support

The last user of the zboot code was the KZM-A9-GT legacy board code,
which has been removed.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>