src: use namespace prefix osmo_* for misc utils

Summary of changes:

s/bcd2char/osmo_bcd2char/g
s/char2bcd/osmo_char2bcd/g
s/hexparse/osmo_hexparse/g
s/hexdump/osmo_hexdump/g
s/hexdump_nospc/osmo_hexdump_nospc/g
s/ubit_dump/osmo_ubit_dump/g
s/static_assert/osmo_static_assert/g
diff --git a/openbsc/src/libbsc/gsm_04_08_utils.c b/openbsc/src/libbsc/gsm_04_08_utils.c
index 7599cea..4d8bdc6 100644
--- a/openbsc/src/libbsc/gsm_04_08_utils.c
+++ b/openbsc/src/libbsc/gsm_04_08_utils.c
@@ -134,7 +134,7 @@
 };
 
 /* verify that the two tables match */
-static_assert(sizeof(ctype_by_chreq) ==
+osmo_static_assert(sizeof(ctype_by_chreq) ==
 	      sizeof(((struct gsm_network *) NULL)->ctype_by_chreq), assert_size);
 
 /*