fiiom3k: Temporarily disable filter rolloff programming

(Hardware control isn't wired into ALSA properly)

Change-Id: Iac537d2d90a6119b8c002cd38a558a4ebb3321eb

bootloader/rocker_linux.c

@@ -473,6 +473,7 @@ static void adb(int start)
     lcd_set_foreground(LCD_RGBPACK(255, 0, 0));
     lcd_putsf(0, 1, "ADB not supported!");
     sleep(2*HZ);
+    (void)start;
 #else
     pid_t pid = fork();
     if(pid == 0)

firmware/drivers/audio/fiiolinux_codec.c

@@ -69,6 +69,10 @@ void audiohw_preinit(void)
 {
     alsa_controls_init();
     hw_open();
+    // set 19/'ADC Mux' 0
+    // set 4/'Digital Capture Volume' 0
+    // set 6/'Mic Volume' 0
+    // set 11/'DACR Playback Volume' 0  (wtf??  vortex used 1, of used 0)
 }
 
 void audiohw_postinit(void)
@@ -89,7 +93,7 @@ void audiohw_set_frequency(int fsel)
 void audiohw_set_volume(int vol_l, int vol_r)
 {
     int vol[2];
-   
+
     vol[0] = vol_l / 20;
     vol[1] = vol_r / 20;
 
@@ -145,10 +149,10 @@ void audiohw_set_filter_roll_off(int value)
        1 = Slow;
        2 = Short Sharp
        3 = Short Slow */
-#if defined(FIIO_M3K)
+#if 0 //  defined(FIIO_M3K)
+    // AK4376 supports this but the control isn't wired into ALSA!
     long int value_hw = value;
     alsa_controls_set_ints("AK4376 Digital Filter", 1, &value_hw);
-#else
-    (void)value;
 #endif
+    (void)value;
 }