MIPS: ralink: fix spis group pinmux

pwm function for spis conflicts with uart2 and uart1, fix this by changing it
to pwm_uart2, which reflects the real use of these pins with these pinmux
(2 for pwm and 2 for uart).

Signed-off-by: Álvaro Fernández Rojas <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/13369/
Signed-off-by: Ralf Baechle <[email protected]>

arch/mips/ralink/mt7620.c

@@ -175,7 +175,7 @@ static struct rt2880_pmx_func spi_cs1_grp_mt7628[] = {
 };
 
 static struct rt2880_pmx_func spis_grp_mt7628[] = {
-	FUNC("pwm", 3, 14, 4),
+	FUNC("pwm_uart2", 3, 14, 4),
 	FUNC("util", 2, 14, 4),
 	FUNC("gpio", 1, 14, 4),
 	FUNC("spis", 0, 14, 4),