ARM: dts: sun8i: r40: Fix register base address for SPI2 and SPI3

When the SPI device nodes were added, SPI2 and SPI3 had incorrect
register base addresses.

Fix the base address for both of them.

Fixes: 554581b7 ("ARM: dts: sun8i: R40: Add SPI controllers nodes and pinmuxes")
Reported-by: JuanEsf <juanesf91@gmail.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>