[PATCH] drivers: usb: Fix config indentation

[Ruben Di Battista]

The indentation was messing up with the scripts/build-whitelist.sh that
was marking SYS_USB_EVENT_POLL_VIA_INT_QUEUE (and probably also the
other indented options) erroneously as ad-hoc configure option with the
following error:

```
Error: You must add new CONFIG options using Kconfig
The following new ad-hoc CONFIG options were detected:
CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
```
---
 drivers/usb/Kconfig | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 756a4ec402..34881a12b8 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -113,14 +113,14 @@ choice
 	---help---
 	  Enable a polling mechanism for USB keyboard.
 
-	config SYS_USB_EVENT_POLL
-		bool "Interrupt polling"
+config SYS_USB_EVENT_POLL
+    bool "Interrupt polling"
 
-	config SYS_USB_EVENT_POLL_VIA_INT_QUEUE
-		bool "Poll via interrupt queue"
+config SYS_USB_EVENT_POLL_VIA_INT_QUEUE
+    bool "Poll via interrupt queue"
 
-	config SYS_USB_EVENT_POLL_VIA_CONTROL_EP
-		bool "Poll via control EP"
+config SYS_USB_EVENT_POLL_VIA_CONTROL_EP
+    bool "Poll via control EP"
 
 endchoice
 
-- 
2.28.0