depmod: pair in a modules.load.recovery on BOARD_VENDOR_RAMDISK_RECOVERY_KERNEL_MODULES_LOAD

If the BoardConfig defined BOARD_VENDOR_RAMDISK_MODULES_LOAD and
BOARD_VENDOR_RAMDISK_RECOVERY_KERNEL_MODULES_LOAD, generate both a
modules.load and modules.load.recovery respectively on the vendor
ramdisk.  BOARD_VENDOR_RAMDISK_MODULES must be the set, or super set,
of all the modules represented in both of *_LOAD BOARD variables.

Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 151950334
Test: build, confirm, fastboot flashall, boot with split.
Change-Id: Ib2925aec6ea7a2a01a554c808d6697d8c85f9fc0