Set cmake and kconfig to resides outside hal

Make explicity that Cmake & Kconfig resides outside hal repository.
Now, all rules should be handled at <zephyr>/modules/hal_gigadevice.

Signed-off-by: Gerson Fernando Budke <[email protected]>

Author: nandojve

CMakeLists.txt

@@ -1,2 +1,4 @@
+name: hal_gigadevice
 build:
-  cmake: .
+  cmake-ext: True
+  kconfig-ext: True