ARM: OMAP: dma.c: Remove unused function

Remove the function get_gdma_dev() that is not used anywhere.

This was partially found by using a static code analysis program called cppcheck.
Signed-off-by: NRickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/plat-omap/dma.c

@@ -151,14 +151,6 @@ static int omap_dma_in_1510_mode(void)
 #endif
 
 #ifdef CONFIG_ARCH_OMAP1
-static inline int get_gdma_dev(int req)
-{
-	u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
-	int shift = ((req - 1) % 5) * 6;
-
-	return ((omap_readl(reg) >> shift) & 0x3f) + 1;
-}
-
 static inline void set_gdma_dev(int req, int dev)
 {
 	u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;