ext4: move s_reserved_gdt_blocks and addressable checking into ext4_check_geometry()

These two checkings are more suitable to be put into
ext4_check_geometry() rather than spreading outside.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20230323140517.1070239-7-yanaijie@huawei.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>