uboot-imx

ARM: remove redundant asmlinkage define

Use asmlinkage defined in include/linux/linkage.h if necessary.
Actually no ARM board uses asmlinkage, so this commit has no impact.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>