Add partition size check to boot partitions

Since android devices are partitioned at the factory and the partitions
can't be resized aftwards, make allows you to specify that partition
size and asserts that the contents don't exceed it. Soong also needed
this check.

Bug: 377562951
Test: Manually modified BOARD_BOOTIMAGE_PARTITION_SIZE to test the warning and error
Change-Id: I2368b350fb99c4055b14baa84b4964012f4934ef