module: Remove unused macros module_addr_min/max

Unused macros reported by [-Wunused-macros].

These macros are introduced to record the bound address of modules.

Commit 80b8bf43 ("module: Always have struct mod_tree_root") made
"struct mod_tree_root" always present and its members addr_min and
addr_max can be directly accessed.

Macros module_addr_min and module_addr_min are not used anymore, so remove
them.

Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mcgrof: massaged the commit messsage as suggested by Miroslav]
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>