package/efivar: don't install in $(HOST_DIR)/usr

For years already, $(HOST_DIR)/usr is deprecated. Install directly in
$(HOST_DIR). This will trigger a check-package error in the following
commit.

Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit 47910ccc361934ab4b3fbcfe05530f38de07844f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/efivar/efivar.mk

@@ -39,7 +39,7 @@ define EFIVAR_BUILD_CMDS
 endef
 
 define HOST_EFIVAR_INSTALL_CMDS
-	$(INSTALL) -D -m 0755 $(@D)/src/makeguids $(HOST_DIR)/usr/bin/makeguids
+	$(INSTALL) -D -m 0755 $(@D)/src/makeguids $(HOST_DIR)/bin/makeguids
 endef
 
 define EFIVAR_INSTALL_STAGING_CMDS