ARM: dts: at91: fixes uart pinctrl, set pullup on rx, clear pullup on tx

Remove pullup on uart TX signals, they are push-pull outputs thus
pullups are pointless.

Add pullup on uart RX signals, they prevent the RX signals to be left
floating and so consuming a useless extra amount of power in crowbarred
state if nothing is connected to RX.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/boot/dts/at91sam9263.dtsi

@@ -437,8 +437,8 @@
 				usart0 {
 					pinctrl_usart0: usart0-0 {
 						atmel,pins =
-							<AT91_PIOA 26 AT91_PERIPH_A AT91_PINCTRL_PULL_UP	/* PA26 periph A with pullup */
-							 AT91_PIOA 27 AT91_PERIPH_A AT91_PINCTRL_NONE>;	/* PA27 periph A */
+							<AT91_PIOA 26 AT91_PERIPH_A AT91_PINCTRL_NONE
+							 AT91_PIOA 27 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
 					};
 
 					pinctrl_usart0_rts: usart0_rts-0 {
@@ -455,8 +455,8 @@
 				usart1 {
 					pinctrl_usart1: usart1-0 {
 						atmel,pins =
-							<AT91_PIOD 0 AT91_PERIPH_A AT91_PINCTRL_PULL_UP	/* PD0 periph A with pullup */
-							 AT91_PIOD 1 AT91_PERIPH_A AT91_PINCTRL_NONE>;	/* PD1 periph A */
+							<AT91_PIOD 0 AT91_PERIPH_A AT91_PINCTRL_NONE
+							 AT91_PIOD 1 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
 					};
 
 					pinctrl_usart1_rts: usart1_rts-0 {
@@ -473,8 +473,8 @@
 				usart2 {
 					pinctrl_usart2: usart2-0 {
 						atmel,pins =
-							<AT91_PIOD 2 AT91_PERIPH_A AT91_PINCTRL_PULL_UP	/* PD2 periph A with pullup */
-							 AT91_PIOD 3 AT91_PERIPH_A AT91_PINCTRL_NONE>;	/* PD3 periph A */
+							<AT91_PIOD 2 AT91_PERIPH_A AT91_PINCTRL_NONE
+							 AT91_PIOD 3 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
 					};
 
 					pinctrl_usart2_rts: usart2_rts-0 {