arm64: dts: imx8qxp: add cache info

i.MX8QXP A35 Cluster has 32KB Icache, 32KB Dcache and 512KB L2 Cache
 - Icache is 2-way set associative
 - Dcache is 4-way set associative
 - L2cache is 8-way set associative
 - Line size are 64bytes

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>