[alloctor]: add flags for alloctor

Each of the different alloctor has different alloctor modes,
such as allocating physical continuous memory, secure memory,
etc.

Change-Id: Ib032689f0cfd36b494843dcc176a22c6c9587b6a
Signed-off-by: Rimon Xu <rimon.xu@rock-chips.com>

osal/inc/mpp_allocator.h

@@ -22,6 +22,12 @@
 
 typedef void *MppAllocator;
 
+typedef struct MppAllocatorCfg_t {
+    // input
+    size_t          alignment;
+    RK_U32          flags;
+} MppAllocatorCfg;
+
 typedef struct MppAllocatorApi_t {
     RK_U32  size;
     RK_U32  version;