16k: Add ro.product.cpu.pagesize.max property

The device's max supported page size is determined by the
build variable TARGET_MAX_PAGE_SIZE_SUPPORTED.

Export this variable as system property for use in tests.

Bug: 277360995
Test: atest -c vendor_elf_alignment_test -s <serial>
Change-Id: I4f33a42de359c8119e55056f9fd9c7147c7058ec
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>