mmc: renesas_sdhi: Use BITS_PER_LONG helper

Use the existing BITS_PER_LONG helper definition instead of calculating
this value.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20200302093534.9055-1-geert+renesas@glider.beSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/renesas_sdhi.h

@@ -60,7 +60,7 @@ struct renesas_sdhi {
 	bool doing_tune;
 
 	/* Tuning values: 1 for success, 0 for failure */
-	DECLARE_BITMAP(taps, BITS_PER_BYTE * sizeof(long));
+	DECLARE_BITMAP(taps, BITS_PER_LONG);
 	unsigned int tap_num;
 	unsigned long tap_set;
 };