staging: sm750fb: Add missing Kconfig dependency

The sm750fb driver has few Framebuffer configuration dependencies that
need to be selected in order to get compiled successfully

Signed-off-by: Hari Prasath Gujulan Elango <hgujulan@visteon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>