Rename MSP2_INAV_TZ and MSP2_INAV_SET_TZ

MSP2_COMMON_TZ and MSP2_COMMON_SET_TZ are the new names. Also,
move the definitions to the file msp_protocol_v2_common.h

src/main/fc/fc_msp.c

@@ -1333,7 +1333,7 @@ static bool mspFcProcessOutCommand(uint16_t cmdMSP, sbuf_t *dst, mspPostProcessF
         }
         break;
 
-    case MSP2_INAV_TZ:
+    case MSP2_COMMON_TZ:
         sbufWriteU16(dst, (uint16_t)timeConfig()->tz_offset);
         break;
 
@@ -2132,7 +2132,7 @@ static mspResult_e mspFcProcessInCommand(uint16_t cmdMSP, sbuf_t *src)
         }
         break;
 
-    case MSP2_INAV_SET_TZ:
+    case MSP2_COMMON_SET_TZ:
         timeConfigMutable()->tz_offset = (int16_t)sbufReadU16(src);
         break;
 

src/main/msp/msp_protocol.h

@@ -323,4 +323,5 @@
 #define MSP_SET_RTC              247    //in message          Sets the RTC clock (args: secs(i32) millis(u16))
 
 // MSPv2 includes
+#include "msp_protocol_v2_common.h"
 #include "msp_protocol_v2_inav.h"

src/main/msp/msp_protocol_v2_common.h

@@ -0,0 +1,19 @@
+/*
+ * This file is part of INAV
+ *
+ * INAV is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * INAV is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with INAV.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define MSP2_COMMON_TZ              0x1001  //out message   Gets the TZ offset for the local time (returns: minutes(i16))
+#define MSP2_COMMON_SET_TZ          0x1002  //in message    Sets the TZ offset for the local time (args: minutes(i16))

src/main/msp/msp_protocol_v2_inav.h

@@ -16,5 +16,3 @@
  */
 
 //#define MSP2_INAV_STATUS            0x1000
-#define MSP2_INAV_TZ                0x1001  //out message   Gets the TZ offset for the local time (returns: minutes(i16))
-#define MSP2_INAV_SET_TZ            0x1002  //in message    Sets the TZ offset for the local time (args: minutes(i16))