efi_loader: restructure code for TEE variables

When using secure boot functions needed both for file and TEE based UEFI
variables have to be moved to the common code module efi_var_common.c.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

include/efi_variable.h

@@ -195,4 +195,11 @@ efi_status_t efi_var_mem_ins(u16 *variable_name,
  */
 u64 efi_var_mem_free(void);
 
+/**
+ * efi_init_secure_state - initialize secure boot state
+ *
+ * Return:	status code
+ */
+efi_status_t efi_init_secure_state(void);
+
 #endif