arm64 base page granules
psize	L3	L3 contig	L2	L2 contig	L1	L0
4k	4k	64K (4k*16)	2MB	-		1GB	-
16k	16k	2MB (16k*128)	32MB	1GB (32*32MB)	-	-
64k	64k 	2MB (64k*32)	512MB	-		4TB	-

Only 16K base pages are optional so on a 4K/64K cpu the supported TLB page sizes must be
4K 64K 2MB 512MB 1G 4TB(*)

16K base page granules add 16K and 32MB. 16K contig pages line up with existing page sizes in the 4K/64K granule.

* 4TB might be optional based on some additional feature.