libtrusty: Remove PAGE_SIZE usage

bionic provides PAGE_SIZE macro which happens to also match the
4096 chunk size in the tips_test.

PAGE_SIZE is being removed as no other libc provides this and
Android is moving towards being page-size-agnostic.

Use 4096 chunk size for tipc-tests; fix incorrect size in
munmap cleanup; and add failure log for send-fd test.

Test: tipc-test -t "send-fd"
Bug: 294914413
Change-Id: I7e5ec6480fff6bc1b4e8eed57eadf081cf82a72f
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>