ARM: ep93xx: export ep93xx_chip_revision

ep93xx_chip_revision is used by the pata_ep93xx driver,
which can be a loadable module. Exporting the symbol
avoids a link error in this case.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NHartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>

arch/arm/mach-ep93xx/core.c

@@ -242,6 +242,7 @@ unsigned int ep93xx_chip_revision(void)
 	v >>= EP93XX_SYSCON_SYSCFG_REV_SHIFT;
 	return v;
 }
+EXPORT_SYMBOL_GPL(ep93xx_chip_revision);
 
 /*************************************************************************
  * EP93xx GPIO