16k: Align shared libraries and executables to 4k by default

The default ELF segment alignment will be 4096. This alignment
can be overriden by setting the desired alignment in
PRODUCT_MAX_PAGE_SIZE_SUPPORTED flag. The alignment has to be
a multiple of the configured kernel page size.

Test: Built changes for Pixel 4a, 6 and checked alignment.
Bug: 276963698
Bug: 276801883
(cherry picked from https://android-review.googlesource.com/q/commit:05d4d901146d96634ad0ff3a9982c9c87c394f18)
Merged-In: Icb380041a5b27da1fa0d86b302e1e7cde9a236d7
Change-Id: Icb380041a5b27da1fa0d86b302e1e7cde9a236d7