arch/Kconfig: Drop references to powerpc PAGE_SIZE symbols

In the previous commit powerpc added PAGE_SIZE related config symbols
using the generic names.

So there's no need to refer to them in the definition of
PAGE_SIZE_LESS_THAN_64KB etc, the negative dependency on the generic
symbol is sufficient (in this case !PAGE_SIZE_64KB).
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220505125123.2088143-2-mpe@ellerman.id.au

arch/Kconfig

@@ -1007,12 +1007,10 @@ config PAGE_SIZE_LESS_THAN_64KB
 	depends on !IA64_PAGE_SIZE_64KB
 	depends on !PAGE_SIZE_64KB
 	depends on !PARISC_PAGE_SIZE_64KB
-	depends on !PPC_64K_PAGES
 	depends on PAGE_SIZE_LESS_THAN_256KB
 
 config PAGE_SIZE_LESS_THAN_256KB
 	def_bool y
-	depends on !PPC_256K_PAGES
 	depends on !PAGE_SIZE_256KB
 
 # This allows to use a set of generic functions to determine mmap base