sys_memory: Improve allocation/deallocation syscalls

[elad335]

• Do not iterate through all allocations from sys_memory_allocate_from_container everytime sys_memory_free is called in order to search allocation's associated memory container, instead use an atomic lookup table.
• Remove lv2_memory_alloca which used to track sys_memory_allocate_from_container allocations, no longer needed.
• Add missing EALIGN error checks in sys_memory_allocate(_from_contao
  iner) syscalls where this error code is returned if size is 0 according to reversing.
• Fixes a case where sys_memory_free could deallocate PPU stack memory where it shouldn't be able to.
• Fix race condition in sys_memory_free syscall where the returned memory could get into the main memory container instead of the one selected by sys_memory_allocate_from_container, this race can occure because idm::select container searching was not atomic with deallocation.
  Race example:

u32 addr_thr1;
u32 addr_thr2;

Thread 1:
sys_memory_allocate(..., &addr_thr1);
Thread 2:
sys_memory_free(addr_thr1);
sys_memory_allocate_from_conatiner(..., &addr_thr2);
Thread 1:
sys_memory_free(addr_thr1); // if addr_thr1 == addr_thr2, the race can happen here.

[elad335]

Oh I forgot, this also fixes a case where sys_memory_free could deallocate PPU stack memory where it shouldn't be able to.