refactor kernel module build, add version support

Refactor the build support for kernel modules. This refactoring is
leveraged to add support for directories of kernel modules in each
partition. To add a directory of kernel modules, define
BOARD_KERNEL_MODULE_DIRS to include the directory name, for example:

BOARD_KERNEL_MODULE_DIRS := 5.4

The build will then check all the usual kernel module related macros
with an extension of _5.4, for example you can define

BOARD_VENDOR_KERNEL_MODULES_5.4 := <modules to copy>
BOARD_VENDOR_KERNEL_MODULES_ARCHIVE_5.4 = <path to archive file>
BOARD_VENDOR_KERNEL_MODULES_LOAD_5.4 := <modules for load list>

Bug: 157645635
Change-Id: I1687d0ec85c1dcf21350350623b4689aba3f6717
Merged-In: I1687d0ec85c1dcf21350350623b4689aba3f6717