Introduce concept of Process Resources (PR_MEM), implement necessary syscalls

include/m/syscall_defs.h

@@ -5,10 +5,14 @@
 #define SYS_PROC_TEST 2
 #define SYS_PROC_MAP  3
 #define SYS_PROC_UNMAP 4
+#define SYS_PROC_CREATE_RESOURCE_MEM 5
+#define SYS_PROC_DROP_RESOURCE 6
 
 #define SR_OK                0
 #define SR_SYSCALL_NOT_FOUND 1
 #define SR_UNALIGNED         2
 #define SR_OOM_ERROR         3
+#define SR_NOT_FOUND         4
+#define SR_BAD_ADDRESS_SPACE 5
 
 #endif // _M_SYSCALL_DEFS_H