Adds support for correct Alps EC10E roller hookup (#261)

Enhanced roller update (thx to Mike Blandford https://www.rcgroups.com/forums/showpost.php?p=46929617&postcount=9974 )

* TX12 should also have ROTARY_ENCODER_GRANULARITY 2

radio/src/opentx.h

@@ -580,10 +580,6 @@ bool setTrimValue(uint8_t phase, uint8_t idx, int trim);
 
 #if defined(PCBSKY9X)
   #define ROTARY_ENCODER_GRANULARITY (2 << g_eeGeneral.rotarySteps)
-#elif defined(RADIO_FAMILY_T16) && !defined(RADIO_T18)
-  #define ROTARY_ENCODER_GRANULARITY (1)
-#elif defined(RADIO_TX12)
-  #define ROTARY_ENCODER_GRANULARITY (1)
 #else
   #define ROTARY_ENCODER_GRANULARITY (2)
 #endif

radio/src/targets/common/arm/stm32/rotary_encoder_driver.cpp

@@ -72,25 +72,34 @@ void rotaryEncoderInit()
 void rotaryEncoderCheck()
 {
 #if (defined(RADIO_FAMILY_T16) && !defined(RADIO_T18)) || defined(RADIO_TX12)
-  static uint8_t  state = 0;
+  static uint8_t state = 0;
   uint8_t pins = ROTARY_ENCODER_POSITION();
 
   if (pins != (state & 0x03) && !(readKeys() & (1 << KEY_ENTER))) {
-    if ((pins & 0x01) ^ ((pins & 0x02) >> 1)) {
-      if ((state & 0x03) == 3)
-        ++rotencValue;
-      else
-        --rotencValue;
-    }
-    else
-    {
-      if ((state & 0x03) == 3)
-         --rotencValue;
-      else if ((state & 0x03) == 0)
-         ++rotencValue;
-    }
-    state &= ~0x03 ;
-    state |= pins ;
+	if ((pins ^ (state & 0x03)) == 0x03)
+	{
+		if (pins == 3)
+		{
+			rotencValue += 2;
+		}
+		else
+		{
+			rotencValue -= 2;
+		}
+	}
+	else
+	{
+		if ((state & 0x01) ^ ((pins & 0x02) >> 1))
+		{
+			rotencValue -= 1;
+		}
+		else
+		{
+			rotencValue += 1;
+		}
+	}
+    state &= ~0x03;
+    state |= pins;
 #else
   uint8_t newPosition = ROTARY_ENCODER_POSITION();
   if (newPosition != rotencPosition && !(readKeys() & (1 << KEY_ENTER))) {