gpio: sprd: Add missing break in switch statement

Fix the following warning by adding a missing break:

drivers/gpio/gpio-eic-sprd.c: In function ‘sprd_eic_irq_set_type’:
drivers/gpio/gpio-eic-sprd.c:403:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
switch (flow_type) {
^~~~~~
drivers/gpio/gpio-eic-sprd.c:435:2: note: here
default:
^~~~~~~

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <[e-mail]>
Reviewed-by: Baolin Wang <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-eic-sprd.c

···
 		default:
 			return -ENOTSUPP;
 		}
+		break;
 	default:
 		dev_err(chip->parent, "Unsupported EIC type.\n");
 		return -ENOTSUPP;