video/logo: move logo selection logic to Kconfig

video/logo: move logo selection logic to Kconfig

Now that the path to the logo file can be directly entered in Kbuild,
there is no more need to handle all the logo file selection in the
Makefile and the C files.

The only exception is the logo_spe_clut224 which is only used by the
Cell processor (found for example in the Playstation 3) [1]. This
extra logo uses its own different image which shows up on a separate
line just below the normal logo. Because the extra logo uses a
different image, it can not be factorized under the custom logo logic.

Move all the logo file selection logic to Kbuild (except from the
logo_spe_clut224.ppm), this done, clean-up the C code to only leave
one entry for each logo type (monochrome, 16-colors and 224-colors).

[1] Cell SPE logos
Link: https://lore.kernel.org/all/20070710122702.765654000@pademelon.sonytel.be/
Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Signed-off-by: Helge Deller <deller@gmx.de>