arm64: dts: rockchip: Sort rk3399 firefly pinmux entries

Sort the rk3399 firefly pinmux entries in alphabetical
order and de-dupe the pmic entries.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Link: https://lore.kernel.org/r/20210613215237.830160-3-pbrobinson@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>