omap: mcbsp: Remove rx_/tx_word_length variables

These variables got unused after ("omap: mcbsp: Drop in-driver transfer
support") but was noticed only afterwards.
Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/include/plat/mcbsp.h

@@ -385,8 +385,6 @@ struct omap_mcbsp {
 	void __iomem *io_base;
 	u8 id;
 	u8 free;
-	omap_mcbsp_word_length rx_word_length;
-	omap_mcbsp_word_length tx_word_length;
 
 	int rx_irq;
 	int tx_irq;

arch/arm/plat-omap/mcbsp.c

@@ -869,9 +869,6 @@ void omap_mcbsp_start(unsigned int id, int tx, int rx)
 	if (cpu_is_omap34xx())
 		omap_st_start(mcbsp);
 
-	mcbsp->rx_word_length = (MCBSP_READ_CACHE(mcbsp, RCR1) >> 5) & 0x7;
-	mcbsp->tx_word_length = (MCBSP_READ_CACHE(mcbsp, XCR1) >> 5) & 0x7;
-
 	/* Only enable SRG, if McBSP is master */
 	w = MCBSP_READ_CACHE(mcbsp, PCR0);
 	if (w & (FSXM | FSRM | CLKXM | CLKRM))