Kernel: Move super_pages section into the bottom 16MB

This ensures that pages returned by
MM.allocate_supervisor_physical_page() have a physical address that
is in the bottom 16MB and can thus be used by the SB16 driver for DMA.

Fixes SerenityOS#8092.

Kernel/linker.ld

@@ -8,10 +8,19 @@ SECTIONS
 
  start_of_kernel_image = .;
 
- .text ALIGN(4K) : AT (ADDR(.text) - KERNEL_VIRTUAL_BASE)
+ .boot ALIGN(4K) : AT (ADDR(.boot) - KERNEL_VIRTUAL_BASE)
  {
  $<TARGET_OBJECTS:boot>
  *(.multiboot)
+ }
+
+ .super_pages ALIGN(4K) : AT (ADDR(.super_pages) - KERNEL_VIRTUAL_BASE)
+ {
+ *(.super_pages)
+ }
+
+ .text ALIGN(4K) : AT (ADDR(.text) - KERNEL_VIRTUAL_BASE)
+ {
  start_of_kernel_text = .;
 
  start_of_safemem_text = .;
@@ -70,8 +79,6 @@ SECTIONS
 
  . = ALIGN(4K);
  *(.heap)
- . = ALIGN(4K);
- *(.super_pages)
  }
 
  end_of_kernel_image = .;