dts: starfive: Switch to using upstream DT

dts: starfive: Switch to using upstream DT

Enable OF_UPSTREAM to use upstream DT and add starfive/ prefix to
the DEFAULT_DEVICE_TREE. Rename jh7110-starfive-visionfive-2-u-boot.dtsi
to jh7110-starfive-visionfive-2-v1.3b-u-boot.dtsi and set the v1.3b
device tree as the default device tree.

Drop redundant DT files from arch/riscv/dts/ and redundant clock and
reset definitions from include/dt-bindings/.

Since the old clock definitions is a little different from those in
upstream Linux, update the clock definitions in clock drivers
accordingly.

Tested-by: Anand Moon <linux.amoon@gmail.com>
Tested-by: E Shattow <lucent@gmail.com>
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>