kernel/process: Use accessors instead of class members for referencing segment array

Using member variables for referencing the segments array increases the
size of the class in memory for little benefit. The same behavior can be
achieved through the use of accessors that just return the relevant
segment.

src/core/loader/nso.cpp

@@ -127,7 +127,7 @@ VAddr AppLoader_NSO::LoadModule(FileSys::VirtualFile file, VAddr load_base) {
         // Resize program image to include .bss section and page align each section
         bss_size = PageAlignSize(mod_header.bss_end_offset - mod_header.bss_start_offset);
     }
-    codeset->data.size += bss_size;
+    codeset->DataSegment().size += bss_size;
     const u32 image_size{PageAlignSize(static_cast<u32>(program_image.size()) + bss_size)};
     program_image.resize(image_size);