mmc: sdricoh_cs: remove unused sdricoh_readw function

clang with W=1 reports
drivers/mmc/host/sdricoh_cs.c:104:28: error: unused function
  'sdricoh_readw' [-Werror,-Wunused-function]
static inline unsigned int sdricoh_readw(struct sdricoh_host *host,
                           ^
This function is not used, so remove it.
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230319164744.1707169-1-trix@redhat.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdricoh_cs.c

@@ -101,14 +101,6 @@ static inline void sdricoh_writel(struct sdricoh_host *host, unsigned int reg,
 
 }
 
-static inline unsigned int sdricoh_readw(struct sdricoh_host *host,
-					 unsigned int reg)
-{
-	unsigned int value = readw(host->iobase + reg);
-	dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
-	return value;
-}
-
 static inline void sdricoh_writew(struct sdricoh_host *host, unsigned int reg,
 					 unsigned short value)
 {