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/libabis/e1_input.c b/openbsc/src/libabis/e1_input.c
index dd33852..089d544 100644
--- a/openbsc/src/libabis/e1_input.c
+++ b/openbsc/src/libabis/e1_input.c
@@ -107,11 +107,11 @@
 	uint8_t control_foo; /* fake UM's ... */
 } __attribute__((packed));
 
-static_assert(offsetof(struct fake_linux_lapd_header, hatype) == 2,    hatype_offset);
-static_assert(offsetof(struct fake_linux_lapd_header, halen) == 4,     halen_offset);
-static_assert(offsetof(struct fake_linux_lapd_header, addr) == 6,      addr_offset);
-static_assert(offsetof(struct fake_linux_lapd_header, protocol) == 14, proto_offset);
-static_assert(sizeof(struct fake_linux_lapd_header) == 16,	       lapd_header_size);
+osmo_static_assert(offsetof(struct fake_linux_lapd_header, hatype) == 2,    hatype_offset);
+osmo_static_assert(offsetof(struct fake_linux_lapd_header, halen) == 4,     halen_offset);
+osmo_static_assert(offsetof(struct fake_linux_lapd_header, addr) == 6,      addr_offset);
+osmo_static_assert(offsetof(struct fake_linux_lapd_header, protocol) == 14, proto_offset);
+osmo_static_assert(sizeof(struct fake_linux_lapd_header) == 16,	       lapd_header_size);
 
 
 static int pcap_fd = -1;
@@ -229,12 +229,12 @@
 
 	if (!msg->trx) {
 		LOGP(DRSL, LOGL_ERROR, "rsl_sendmsg: msg->trx == NULL: %s\n",
-			hexdump(msg->data, msg->len));
+			osmo_hexdump(msg->data, msg->len));
 		talloc_free(msg);
 		return -EINVAL;
 	} else if (!msg->trx->rsl_link) {
 		LOGP(DRSL, LOGL_ERROR, "rsl_sendmsg: msg->trx->rsl_link == NULL: %s\n",
-			hexdump(msg->data, msg->len));
+			osmo_hexdump(msg->data, msg->len));
 		talloc_free(msg);
 		return -EIO;
 	}