"ARM: OMAP: build mach-omap code only if needed" moved around the
ARCH_OMAP2PLUS stanza, but accidentally dropped the seleciton of
TI_PRIV_EDMA in the process. Add it back.
Cc: Arnd Bergmann <arnd@arndb.de> Cc: Tony Lindgren <tony@atomide.com> Signed-off-by: Olof Johansson <olof@lixom.net>