ARM: SAMSUNG: Remove printk for failed memory allocation

Omit an extra message for a memory allocation failure in adc.c and
platformdata.c.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>