[RFC][PATCH] Fix SND_OMAP_SOC_MCBSP=m undefined symbols

["George G. Davis" <gdavis@mvista.com>]

When building ASoC drivers as modules for SND_OMAP_SOC_MCBSP based
targets, the build fails because omap_ctrl_{read,write}l lack exports.
So add the missing exports for omap_ctrl_{read,write}[bwl] to allow
building these ASoC (and other) drivers as modules.

Signed-off-by: George G. Davis <gdavis@mvista.com>

diff --git a/arch/arm/mach-omap2/control.c b/arch/arm/mach-omap2/control.c
index 5f3aad9..6b14639 100644
--- a/arch/arm/mach-omap2/control.c
+++ b/arch/arm/mach-omap2/control.c
@@ -36,29 +36,35 @@ u8 omap_ctrl_readb(u16 offset)
 {
 	return __raw_readb(OMAP_CTRL_REGADDR(offset));
 }
+EXPORT_SYMBOL(omap_ctrl_readb);
 
 u16 omap_ctrl_readw(u16 offset)
 {
 	return __raw_readw(OMAP_CTRL_REGADDR(offset));
 }
+EXPORT_SYMBOL(omap_ctrl_readw);
 
 u32 omap_ctrl_readl(u16 offset)
 {
 	return __raw_readl(OMAP_CTRL_REGADDR(offset));
 }
+EXPORT_SYMBOL(omap_ctrl_readl);
 
 void omap_ctrl_writeb(u8 val, u16 offset)
 {
 	__raw_writeb(val, OMAP_CTRL_REGADDR(offset));
 }
+EXPORT_SYMBOL(omap_ctrl_writeb);
 
 void omap_ctrl_writew(u16 val, u16 offset)
 {
 	__raw_writew(val, OMAP_CTRL_REGADDR(offset));
 }
+EXPORT_SYMBOL(omap_ctrl_writew);
 
 void omap_ctrl_writel(u32 val, u16 offset)
 {
 	__raw_writel(val, OMAP_CTRL_REGADDR(offset));
 }
+EXPORT_SYMBOL(omap_ctrl_writel);