fix(imxrt): update arch defaults to match v6x

Author: abhijithcv

platforms/nuttx/init/imxrt/rc.board_arch_defaults

@@ -3,6 +3,14 @@
 # imxrt specific defaults
 #------------------------------------------------------------------------------
 
+# Multi-EKF
+param set-default -s EKF2_MULTI_IMU 3
+param set-default SENS_IMU_MODE 0
+
+param set-default -s IMU_GYRO_FFT_EN 1
+
 param set-default -s MC_AT_EN 1
 
-set LOGGER_BUF 32
+param set-default -s UAVCAN_ENABLE 2
+
+set LOGGER_BUF 64