libhwui: Move MAX_PAGE_SIZE into uirenderer namespace

The MAX_PAGE_SIZE define conflicts with bionic's MAX_PAGE_SIZE.

Move libhwui specific page size constants into uirenderer
namespace as constexprs instead of preprocessor defines.

Bug: 296275298
Test: mma
Change-Id: I4df1cad2b80df27545ad3a61017dd98f1596bbac
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>