Revert "image: Remove #ifdefs from select_ramdisk()"

This reverts commit f33a2c1b.

This causes a crash on some platforms as seen here:
https://lore.kernel.org/r/f153017b-c41a-0d32-67b9-f288e695f900@baylibre.com/



Reported-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Tom Rini <trini@konsulko.com>