OMAP3: igep00x0: add missing include mach-types.h

OMAP3: igep00x0: add missing include mach-types.h

Current '#if' directives (used in igep00x0.h config file) comparing MACH_TYPE
values in igep00x0.h doesn't work as expected. The comparision between
CONFIG_MACH_TYPE and MACH_TYPE_IGEP0020 is always true independent of the IGEP
machine configured.

For example, following directive

 if (CONFIG_MACH_TYPE == MACH_TYPE_IGEP0020)
    define something
 endif

Is always evaluated true although we configure u-boot for MACH_TYPE_IGEP0030.

The build doesn't shows any error so looks that both defines had always the same
value. Including the mach-types.h file sets properly the value of
MACH_TYPE_IGEPxxxx.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>