developer-tools: Update developer-tools commit

Update developer-tools submodule to include
license check for yaml/yml files.

Signed-off-by: Ahmed.Ismail <Ahmed.Ismail@arm.com>

developer-tools @ 6c75a2d4

-Subproject commit cfa92134f702c7548242e69b003a2a8f07b56ded
+Subproject commit 6c75a2d440e409ada7e120b1ddc552e309702db0