package/checkpolicy: drop bogus CHECKPOLICY_STAGING_CMDS

Commit "b06110621d checkpolicy: allow compiling for target" contains a
typo that prevents installing to staging. It also forgot to enable
CHECKPOLICY_INSTALL_STAGING.

But the package does not install headers or libraries, only ELF and
manual files.
So instead of fixing the install to staging, drop the bogus
CHECKPOLICY_STAGING_CMDS.

Cc: Clayton Shotwell <clayton.shotwell@collins.com>
Cc: Matt Weber <matthew.weber@collins.com>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 14956d8908776e52ea9ace2fbb3f41716ebb4262)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/checkpolicy/checkpolicy.mk

@@ -20,11 +20,6 @@ define CHECKPOLICY_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(CHECKPOLICY_MAKE_OPTS) DESTDIR=$(STAGING_DIR)
 endef
 
-define CHECKPOLICY_STAGING_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(CHECKPOLICY_MAKE_OPTS) DESTDIR=$(STAGING_DIR) install
-
-endef
-
 define CHECKPOLICY_INSTALL_TARGET_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(CHECKPOLICY_MAKE_OPTS) DESTDIR=$(TARGET_DIR) install
 endef