ARM: dts: BCM5301X: Move CRU devices to the CRU node

Clocks and thermal blocks are part of the CRU ("Clock and Reset Unit" or
"Central Resource Unit").

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>