csky: fix old style declaration in module.c

With W=1, gcc warns about the inline keyword in the wrong place:

arch/csky/kernel/module.c:43:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Guo Ren <guoren@kernel.org>