update the EB+MCF-EV123 board support

update the EB+MCF-EV123 board support

This patch updates the support for EB+MCF-EV123 board and needs
the [PATCH 1/2 V3] new video driver for bus vcxk framebuffers

* remove the board framebuffer driver
* use the common bus_vcxk framebuffer driver
* adds bmp support
* adds splashimage support
* fix serveral cosmetical errors

Signed-off-by: Jens Scharsig <esw@bus-elektronik.de>
[agust@denx.de: fixed some style issues before applying]
Signed-off-by: Anatolij Gustschin <agust@denx.de>