spi: ti_qspi: fix unit address

Fix unit address to match the first address specified in the reg
property of the node in example.
Signed-off-by: Kangmin Park <l4stpr0gr4m@gmail.com>
Link: https://lore.kernel.org/r/1589873541-5587-1-git-send-email-l4stpr0gr4m@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/ti_qspi.txt

@@ -29,7 +29,7 @@ modification to bootloader.
 Example:
 
 For am4372:
-qspi: qspi@4b300000 {
+qspi: qspi@47900000 {
 	compatible = "ti,am4372-qspi";
 	reg = <0x47900000 0x100>, <0x30000000 0x4000000>;
 	reg-names = "qspi_base", "qspi_mmap";