ANDROID: 16K: __PAGE_ALIGN dma-bufs size from heap allocations

In order to avoid dma-buf mappings having unaligned end addresses,
__PAGE_ALIGN the buffer size at allocation time.

Bug: 365566776
Bug: 365177458
Bug: 356729201
Change-Id: I4e59d1378f59138db9b58689e32e27ce9f43655c
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
(cherry picked from commit 1e3be49d)