generic: remove linux version checks from myloader.c

The myloader partition parser code uses ifdef wrappers
to make the code usable on kernels below version 3.2.
All targets are using kernel 3.3 at least so the wraper
is not needed. Remove that.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37880 3c298f89-4303-0410-b956-a3cf2f4a3e73