apps/slinky: Dependency issue

- fcb2 and config_fcb2 and log_fcb2 should be selectable via the target
  using syscfgs, it does not need to be specific to the app

Author: vrahane

apps/slinky/pkg.yml

@@ -44,15 +44,3 @@ pkg.deps:
 pkg.deps.I2C_0: test/i2c_scan
 pkg.deps.I2C_1: test/i2c_scan
 pkg.deps.I2C_2: test/i2c_scan
-
-pkg.deps.CONFIG_NFFS:
-    - "@apache-mynewt-core/fs/nffs"
-
-pkg.deps.CONFIG_LITTLEFS:
-    - "@apache-mynewt-core/fs/littlefs"
-
-pkg.deps.CONFIG_FCB:
-    - "@apache-mynewt-core/fs/fcb"
-
-pkg.deps.REBOOT_LOG_FCB:
-    - "@apache-mynewt-core/fs/fcb"