ARM: dts: bcm2711-rpi-4-b: fix sd_io_1v8_reg regulator states

ARM: dts: bcm2711-rpi-4-b: fix sd_io_1v8_reg regulator states

DT schema check complains at sd_io_1v8_reg about the following:

 [1800000, 1, 3300000, 0] is too long
 Additional items are not allowed (3300000, 0 were unexpected)

So fix the states definition.

Fixes: 7dbe8c62ceeb ("ARM: dts: Add minimal Raspberry Pi 4 support")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1628334401-6577-3-git-send-email-stefan.wahren@i2se.com
Signed-off-by: Nicolas Saenz Julienne <nsaenz@kernel.org>