module: Fix selfAssignment cppcheck warning

cppcheck reports the following warnings:

kernel/module/main.c:1455:26: warning: Redundant assignment of 'mod->core_layout.size' to itself. [selfAssignment]
   mod->core_layout.size = strict_align(mod->core_layout.size);
                         ^
kernel/module/main.c:1489:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment]
   mod->init_layout.size = strict_align(mod->init_layout.size);
                         ^
kernel/module/main.c:1493:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment]
   mod->init_layout.size = strict_align(mod->init_layout.size);
                         ^
kernel/module/main.c:1504:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment]
   mod->init_layout.size = strict_align(mod->init_layout.size);
                         ^
kernel/module/main.c:1459:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment]
   mod->data_layout.size = strict_align(mod->data_layout.size);
                         ^
kernel/module/main.c:1463:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment]
   mod->data_layout.size = strict_align(mod->data_layout.size);
                         ^
kernel/module/main.c:1467:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment]
   mod->data_layout.size = strict_align(mod->data_layout.size);
                         ^

This is due to strict_align() being a no-op when
CONFIG_STRICT_MODULE_RWX is not selected.

Transform strict_align() macro into an inline function. It will
allow type checking and avoid the selfAssignment warning.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>