ARM: dts: tacoma: Fix node vs reg mismatch for flash memory

The mismatch lead to a miscalculation of regions in another patch, and
shouldn't be mismatched anyway, so make them consistent.

Fixes: 57564020 ("ARM: dts: aspeed: tacoma: Use 64MB for firmware memory")
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20201022014731.2035438-2-andrew@aj.id.au


Signed-off-by: Joel Stanley <joel@jms.id.au>