Input: ep93xx_keypad - prepare clock before using it

Use clk_prepare_enable()/clk_disable_unprepare() in preparation for switch
to Common Clock Framework.
Signed-off-by: NAlexander Sverdlin <alexander.sverdlin@gmail.com>
Link: https://lore.kernel.org/r/20210613233041.128961-4-alexander.sverdlin@gmail.comSigned-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/ep93xx_keypad.c

@@ -157,7 +157,7 @@ static int ep93xx_keypad_open(struct input_dev *pdev)
 
 	if (!keypad->enabled) {
 		ep93xx_keypad_config(keypad);
-		clk_enable(keypad->clk);
+		clk_prepare_enable(keypad->clk);
 		keypad->enabled = true;
 	}
 
@@ -169,7 +169,7 @@ static void ep93xx_keypad_close(struct input_dev *pdev)
 	struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
 
 	if (keypad->enabled) {
-		clk_disable(keypad->clk);
+		clk_disable_unprepare(keypad->clk);
 		keypad->enabled = false;
 	}
 }