USB host i.MX21: remove dependency on MACH_MX21

the MACH_MX* macros are scheduled for removal, so just depend
on ARCH_MXC instead. The Kconfig text makes it clear on which
SoC the driver runs on.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 file changed