ARM: dts: aspeed-g6: move i2c controllers directly into apb node

We currently have the apb's mapping of the i2c controller space as a
labelled mostly-empty node:

  apb {
    i2c: bus@1e78a000 {
      ranges = <...>;
    };
  }

... and then define the contents of the i2c block later:

  i2c: {
    i2c0: i2c-bus@80 {
      reg = <0x80 0x80>;
    };
    i2c1: i2c-bus@100 {
      reg = <0x100 0x80>;
    };
  }

Krzysztof mentions[1] that isn't convention though, with the top-level
simple-bus being empty and linked via the label. So, drop the label
usage and move the i2c bus definition into the simple-bus node directly
under the apb:

  apb {
     bus@1e78a000 {
      ranges = <...>;

      i2c0: i2c-bus@80 {
        reg = <0x80 0x80>;
      };
      i2c1: i2c-bus@100 {
        reg = <0x100 0x80>;
      };
    };
  }

This will allow us to be consistent when we add new definitions for the
i3c nodes, which would require the latter format.

Link: https://lore.kernel.org/linux-devicetree/c5331cf8-7295-4e6a-ba39-e0751a2c357e@kernel.org/ [1]
Suggested-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: Dawid Glazik <dawid.glazik@linux.intel.com>
Link: https://patch.msgid.link/7c7010a87bb70b9e2abdadfea76d41cdcb88a82f.1777058942.git.dawid.glazik@linux.intel.com
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

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