tools: gpio: add bias flags to lsgpio

Add display of the bias flags.

Signed-off-by: Kent Gibson <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>

tools/gpio/lsgpio.c

···
 		.name = "open-source",
 		.mask = GPIOLINE_FLAG_OPEN_SOURCE,
 	},
+	{
+		.name = "pull-up",
+		.mask = GPIOLINE_FLAG_BIAS_PULL_UP,
+	},
+	{
+		.name = "pull-down",
+		.mask = GPIOLINE_FLAG_BIAS_PULL_DOWN,
+	},
+	{
+		.name = "bias-disabled",
+		.mask = GPIOLINE_FLAG_BIAS_DISABLE,
+	},
 };
 
 void print_flags(unsigned long flags)