Fix false RX loss detection on EEPROM read/write

The problem is caused by hardware counters (timekeeping and PPM/PWM
measurement) that keep running while the firmware is frozen. The result
is misinterpretation of received data.

EEPROM read & write now call a suspend and resume function to make RX
ignore incoming wrong data during reads/writes (and flush the wrong data
on resume).

Fixes issue #1257

(+1 squashed commit)
- Moved the check for skipSamples to the right place.

As commented by hydra

src/main/config/config.c

@@ -829,6 +829,8 @@ void readEEPROM(void)
     if (!isEEPROMContentValid())
         failureMode(10);
 
+    suspendRxSignal();
+
     // Read flash
     memcpy(&masterConfig, (char *) CONFIG_START_FLASH_ADDRESS, sizeof(master_t));
 
@@ -844,6 +846,8 @@ void readEEPROM(void)
 
     validateAndFixConfig();
     activateConfig();
+
+    resumeRxSignal();
 }
 
 void readEEPROMAndNotify(void)
@@ -862,6 +866,8 @@ void writeEEPROM(void)
     uint32_t wordOffset;
     int8_t attemptsRemaining = 3;
 
+    suspendRxSignal();
+
     // prepare checksum/version constants
     masterConfig.version = EEPROM_CONF_VERSION;
     masterConfig.size = sizeof(master_t);
@@ -903,6 +909,8 @@ void writeEEPROM(void)
     if (status != FLASH_COMPLETE || !isEEPROMContentValid()) {
         failureMode(10);
     }
+
+    resumeRxSignal();
 }
 
 void ensureEEPROMContainsValidData(void)