ARM: dts: bcm2710-rpi-3-b-plus: Enable dt nodes for audio, i2c1, spi0

ARM: dts: bcm2710-rpi-3-b-plus: Enable dt nodes for audio, i2c1, spi0

In Tizen dt-overlay is not used, so some device nodes should be
enabled to use. Enable dt nodes for audio, i2c1 and spi0 like
rpi3 b model.

Change-Id: I07504d1ece3c0aeb797ddfc372c956226d316814
Reference: 7fbb122e5232 ("ARM: dts: bcm2710-rpi-3-b: enable spi0 device node")
Reference: 34a29d8d477a ("ARM64: dts: bcm2710-rpi-3-b: enable i2c1")
Reference: 2ad26af6908c ("ARM: dts: bcm2710-rpi-3-b : Change audio node status as "okay"")
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>