board: freescale: ls2080a, ls2088a: Update I2C mux config

Updates the board configuration to enable use of the PCA9547 I2C mux.

Signed-off-by: Stephen Carlson <stcarlso@linux.microsoft.com>
[Squashed ls2088a patch to fix compilation]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/ls2088ardb_qspi_defconfig b/configs/ls2088ardb_qspi_defconfig
index 3b9b53b..1cc382c 100644
--- a/configs/ls2088ardb_qspi_defconfig
+++ b/configs/ls2088ardb_qspi_defconfig
@@ -71,3 +71,4 @@
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_DWC3=y
 CONFIG_EFI_LOADER_BOUNCE_BUFFER=y
+CONFIG_FSL_USE_PCA9547_MUX=y