systemc: Make an include in src/systemc/ext use a relative path.

The includes in src/systemc/ext are supposed to use relative paths so
that they can be included in other bodies of code which aren't based
in gem5 and don't share it's -I-s, or potentially even have access to
anything outside of src/systemc/ext.

Change-Id: Icde457329c2c4ab4689221015bfcfe2ff8b051f0
Reviewed-on: https://gem5-review.googlesource.com/c/16262
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
diff --git a/src/systemc/ext/tlm_core/1/req_rsp/channels/req_rsp_channels/put_get_imp.hh b/src/systemc/ext/tlm_core/1/req_rsp/channels/req_rsp_channels/put_get_imp.hh
index f9821db..7765e9b 100644
--- a/src/systemc/ext/tlm_core/1/req_rsp/channels/req_rsp_channels/put_get_imp.hh
+++ b/src/systemc/ext/tlm_core/1/req_rsp/channels/req_rsp_channels/put_get_imp.hh
@@ -22,7 +22,7 @@
 #define \
     __SYSTEMC_EXT_TLM_CORE_1_REQ_RSP_CHANNELS_REQ_RSP_CHANNELS_PUT_GET_IMP_HH__
 
-#include "tlm_core/1/req_rsp/interfaces/master_slave_ifs.hh"
+#include "../../interfaces/master_slave_ifs.hh"
 
 namespace tlm
 {