powerpc/32: Drop a stale comment about reservation of gigantic pages

A comment about the reservation of gigantic pages was left in MMU_init()
after commit 79cc38de ("powerpc/mm/hugetlb: Add support for
reserving gigantic huge pages via kernel command line")

Remove it.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/959d77be630b9b46a7458f0fbd41dc3a94ec811a.1661938317.git.christophe.leroy@csgroup.eu

arch/powerpc/mm/init_32.c

@@ -82,10 +82,6 @@ void __init MMU_init(void)
 	if (ppc_md.progress)
 		ppc_md.progress("MMU:enter", 0x111);
 
-	/*
-	 * Reserve gigantic pages for hugetlb.  This MUST occur before
-	 * lowmem_end_addr is initialized below.
-	 */
 	if (memblock.memory.cnt > 1) {
 #ifndef CONFIG_WII
 		memblock_enforce_memory_limit(memblock.memory.regions[0].size);