edge: Rename gprs_rlc_ul_header_egprs and gprs_rlc_ul_data_block_info

These struct names are more specific than necessary. They are used
for GPRS (uplink) already. In downlink direction, only a few fields
will be added to the header struct. Add addition,
gprs_rlc_ul_header_egprs does not map directly to an encoded
header, like many other 'header' structs do.

Change the names to fit both modes and both directions:

  gprs_rlc_ul_header_egprs    -> gprs_rlc_data_info
  gprs_rlc_ul_data_block_info -> gprs_rlc_data_block_info

Sponsored-by: On-Waves ehf
diff --git a/src/bts.cpp b/src/bts.cpp
index 52811c2..1ef735b 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -1156,7 +1156,7 @@
 	struct pcu_l1_meas *meas, GprsCodingScheme cs)
 {
 	int rc;
-	struct gprs_rlc_ul_header_egprs rlc_dec;
+	struct gprs_rlc_data_info rlc_dec;
 	struct gprs_rlcmac_ul_tbf *tbf;
 	unsigned len = cs.maxBytesUL();