efi_loader: use LOGC_EFI consistently

The log category should be LOGC_EFI all over the EFI sub-system.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/lib/efi_loader/efi_hii_config.c b/lib/efi_loader/efi_hii_config.c
index ae0f3ec..37d8c66 100644
--- a/lib/efi_loader/efi_hii_config.c
+++ b/lib/efi_loader/efi_hii_config.c
@@ -10,6 +10,8 @@
  * the Makefile.
  */
 
+#define LOG_CATEGORY LOGC_EFI
+
 #include <efi_loader.h>
 
 const efi_guid_t efi_guid_hii_config_routing_protocol