Memmap: Re-organize memory function in two files

memory.cpp/h contains definitions related to acessing memory and
configuring the address space
mem_map.cpp/h contains higher-level definitions related to configuring
the address space accoording to the kernel and allocating memory.

src/video_core/rasterizer.cpp

@@ -9,6 +9,8 @@
 #include "common/profiler.h"
 
 #include "core/hw/gpu.h"
+#include "core/memory.h"
+
 #include "debug_utils/debug_utils.h"
 #include "math.h"
 #include "color.h"