copy kernel modules to ramdisk, add modules.load[.recovery]

Build support exists to copy a set of kernel modules to the recovery,
vendor, and odm images. Extend similar support for copying kernel
modules to the ramdisk via BOARD_RAMDISK_KERNEL_MODULES. If
BOARD_USES_RECOVERY_AS_BOOT, then BOARD_RAMDISK_KERNEL_MODULES is
added to the set of modules to be copied to recovery.

Libmodprobe now supports reading a list of kernel modules to be loaded.
Enable the creation of modules.load and modules.load.recovery files.
These files contain the contents of
BOARD_[RAMDISK|VENDOR|ODM|RECOVERY]_KERNEL_MODULES_LOAD, or if those
variables are not set, the contents of
BOARD_[RAMDISK|VENDOR|ODM|RECOVERY]_KERNEL_MODULES (indicating all
modules should be loaded by default). This allows for
optional customization of the set of modules to be loaded by
libmodprobe and the order they are loaded in.

Bug: 130585369
Change-Id: I9340787d31d71aebc8552344675d9696c189a8a1