arm64: dts: rockchip: Fix UART DMA support for RK3528

arm64: dts: rockchip: Fix UART DMA support for RK3528

Trying to use UART2 DMA for Bluetooth on ArmSoM Sige1 result in tx
timeout when using dma-names = "tx", "rx" as required by the dt-binding:

  Bluetooth: hci0: command 0x0c03 tx timeout
  Bluetooth: hci0: BCM: Reset failed (-110)

Change the dmas order to fix UART DMA support on RK3528.

With this fixed Bluetooth can be loaded using DMA on ArmSoM Sige1:

  Bluetooth: hci0: BCM: chip id 159
  Bluetooth: hci0: BCM: features 0x0f
  Bluetooth: hci0: BCM4362A2
  Bluetooth: hci0: BCM4362A2 (000.017.017) build 0000
  Bluetooth: hci0: BCM4362A2 'brcm/BCM4362A2.hcd' Patch
  Bluetooth: hci0: BCM: features 0x0f
  Bluetooth: hci0: BCM43752A2 UART 37.4MHz Ampak AP6398 sLNA iLNA CL1 [Version: 1091.1173]
  Bluetooth: hci0: BCM4362A2 (000.017.017) build 1173

Fixes: ab6fcb58aedf ("arm64: dts: rockchip: Add UART DMA support for RK3528")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Link: https://lore.kernel.org/r/20250709210831.3170458-1-jonas@kwiboo.se
Signed-off-by: Heiko Stuebner <heiko@sntech.de>