staging: mt7621-mmc: Remove unused macro HOST_MAX_NUM

The macro HOST_MAX_NUM is never used, so remove it.
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/sd.c

@@ -104,8 +104,6 @@
 
 #define DRV_NAME            "mtk-sd"
 
-#define HOST_MAX_NUM        (1) /* +/- by chhung */
-
 #if defined(CONFIG_SOC_MT7620)
 #define HOST_MAX_MCLK       (48000000) /* +/- by chhung */
 #elif defined(CONFIG_SOC_MT7621)