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/ipaccess/ipaccess-firmware.c b/openbsc/src/ipaccess/ipaccess-firmware.c
index a01e61b..6d39107 100644
--- a/openbsc/src/ipaccess/ipaccess-firmware.c
+++ b/openbsc/src/ipaccess/ipaccess-firmware.c
@@ -29,8 +29,8 @@
 
 #define PART_LENGTH 138
 
-static_assert(sizeof(struct sdp_header_entry) == 138, right_entry);
-static_assert(sizeof(struct sdp_firmware) == 158, _right_header_length);
+osmo_static_assert(sizeof(struct sdp_header_entry) == 138, right_entry);
+osmo_static_assert(sizeof(struct sdp_firmware) == 158, _right_header_length);
 
 /* more magic, the second "int" in the header */
 static char more_magic[] = { 0x10, 0x02 };