SAMV71 MCAN: Change Kconfig so that zero is no longer the default value for the size of RXFIFO0, RXFIFO1, and TXFIFIQ. In fact, zero is not an illegal value

arch/arm/src/samv7/Kconfig

@@ -1554,8 +1554,8 @@ endchoice # MCAN0 RX buffer element size
 
 config SAMV7_MCAN0_RXFIFO0_SIZE
 	int "MCAN0 RX FIFO0 size"
-	default 12
-	range 0 64
+	default 8
+	range 1 64
 	---help---
 		Number of receive FIFO 0 elements.  Zero disables FIFO 0.
 
@@ -1598,8 +1598,8 @@ endchoice # MCAN0 RX buffer element size
 
 config SAMV7_MCAN0_RXFIFO1_SIZE
 	int "MCAN0 RX FIFO1 size"
-	default 0
-	range 0 64
+	default 4
+	range 1 64
 	---help---
 		Number of receive FIFO 1 elements for MCAN0.  Zero disables FIFO 1.
 
@@ -1689,8 +1689,8 @@ endchoice # MCAN0 TX buffer element size
 
 config SAMV7_MCAN0_DEDICATED_TXBUFFER_SIZE
 	int "MCAN0 dedicated TX buffer size"
-	default 0
-	range 0 32
+	default 4
+	range 1 32
 	depends on EXPERIMENTAL
 	---help---
 		Number of dedicated TX buffer elements for MCAN0.
@@ -1868,8 +1868,8 @@ endchoice # MCAN1 RX buffer element size
 
 config SAMV7_MCAN1_RXFIFO0_SIZE
 	int "MCAN1 RX FIFO0 size"
-	default 0
-	range 0 64
+	default 8
+	range 1 64
 	---help---
 		Number of receive FIFO 0 elements.  Zero disables FIFO 0.
 
@@ -1912,8 +1912,8 @@ endchoice # MCAN1 RX buffer element size
 
 config SAMV7_MCAN1_RXFIFO1_SIZE
 	int "MCAN1 RX FIFO1 size"
-	default 0
-	range 0 64
+	default 4
+	range 1 64
 	---help---
 		Number of receive FIFO 1 elements for MCAN1.  Zero disables FIFO 1.
 
@@ -2003,8 +2003,8 @@ endchoice # MCAN1 TX buffer element size
 
 config SAMV7_MCAN1_TXEVENTFIFO_SIZE
 	int "MCAN1 TX event FIFO size"
-	default 0
-	range 0 32
+	default 4
+	range 1 32
 	---help---
 		Number of TX event FIFO elements for MCAN1.  Zero disables TX event FIFO.