hsmmc.c glue uses standard GPIO calls

hsmmc.c glue uses standard GPIO calls

Convert the hsmmc init code over to standard GPIO calls:
gpio_request(), gpio_free(), gpio_get_value_cansleep().

NOTE that this doesn't pass GPIO numbers in to hsmmc_init();
those values are still hard-wired.  (For the write protect
signal, the LACK of value is hard-wired...)  So the hsmmc
glue is still kind of problematic.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>