ARM: dts: r8a7790: Remove unit-addresses and regs from integrated caches

The Cortex-A15/A7 cache controllers are integrated controllers, and thus
the device nodes representing them should not have unit-addresses or reg
properties.

Fixes: 2c3de367 ("ARM: dts: r8a7790: Fix W=1 dtc warnings")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>