[core/loader] prevent program_image reallocations in NSO+KIP loading methods (#3639)

also changes some methods to std::span<> as well, but mainly std::vector<> in the NSO/KIP loading stuff is not needed to be memcpy'ed and memmove'd around
this should save a marginal amount of loading time (RDR1)

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3639
Reviewed-by: DraVee <dravee@eden-emu.dev>
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

src/core/hle/kernel/code_set.h

@@ -7,9 +7,9 @@
 #pragma once
 
 #include <cstddef>
+#include <vector>
 
 #include "core/hle/kernel/k_typed_address.h"
-#include "core/hle/kernel/physical_memory.h"
 
 namespace Kernel {
 
@@ -97,8 +97,7 @@ struct CodeSet final {
 #endif
 
     /// The overall data that backs this code set.
-    Kernel::PhysicalMemory memory;
-
+    std::vector<u8> memory;
     /// The segments that comprise this code set.
     std::array<Segment, 3> segments;