powerpc/32s: Fix compile error with CONFIG_PPC_PTDUMP

This patch remove CONFIG_PPC_HTDUMP if not PPC_BOOK3S_64 to avoid
below compile failure on BOOK3S_32:

  In file included from arch/powerpc/mm/dump_hashpagetable.c:27:0:
  ./arch/powerpc/include/asm/plpar_wrappers.h: In function 'get_cede_latency_hint':
  ./arch/powerpc/include/asm/plpar_wrappers.h:27:2: error: implicit declaration of function 'get_lppaca' [-Werror=implicit-function-declaration]
  ...
  arch/powerpc/mm/dump_hashpagetable.c: At top level:
  arch/powerpc/mm/dump_hashpagetable.c:69:13: error: 'SLB_VSID_B' undeclared here (not in a function)
  ...
  arch/powerpc/mm/dump_hashpagetable.c:506:38: error: 'VMEMMAP_BASE' undeclared (first use in this function)
  arch/powerpc/mm/dump_hashpagetable.c:506:35: error: assignment makes integer from pointer without a cast [-Werror]

Fixes: dd5ac03e

 ("powerpc/mm: Fix page table dump build on non-Book3S")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Trim change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>