subprojects: libpisp: Update to 1.2.1

Update the libpisp wrap to use the latest 1.2.1 release which silences
an 'unused-parameter' warning.

Bug: raspberrypi/libpisp#43
Reviewed-by: Naushir Patuck <[email protected]>
Signed-off-by: Christian Rauch <[email protected]>
Acked-by: Kieran Bingham <[email protected]>
Acked-by: Laurent Pinchart <[email protected]>
Signed-off-by: Laurent Pinchart <[email protected]>

Author: christianrauch

subprojects/libpisp.wrap

@@ -2,5 +2,5 @@
 
 [wrap-git]
 url = https://github.com/raspberrypi/libpisp.git
-revision = v1.2.0
+revision = v1.2.1
 depth = 1