AArch64: Minor changes related to 64-bit platform

Changes include
[x] Use %zu for size_t
[x] Use PRId64 to print 64-bit integer value
[x] Use uintptr_t for integer variable used to store address.

Change-Id: I69926cce76b0d645f1abccd584444197a5e40318
Signed-off-by: Marcus Oakland <marcus.oakland@arm.com>
Signed-off-by: Ashok Bhat <ashok.bhat@arm.com>
Merge "AArch64: Minor changes related to 64-bit platform"
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/wilhelm