boards: st: nucleo_wba55cg: Fix west debug

To enable breakpoints on this board, remove the `dgdb_memory_map disable`,
which is a leftover from early development steps.

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
diff --git a/boards/st/nucleo_wba55cg/support/openocd.cfg b/boards/st/nucleo_wba55cg/support/openocd.cfg
index 247de97..1715e7d 100644
--- a/boards/st/nucleo_wba55cg/support/openocd.cfg
+++ b/boards/st/nucleo_wba55cg/support/openocd.cfg
@@ -22,5 +22,3 @@
 reset_config srst_only srst_nogate
 
 source [find target/stm32wbax.cfg]
-
-gdb_memory_map disable