Staging: bcm: Fix udelay related compilation error

Staging: bcm: Fix udelay related compilation error

commit 6788d7dab6a5 ("Staging: bcm: Use udelay instead of msleep for
delays in nvm.c") replaces msleep with udelay values. udelay values
of more than 1000 should be replaced by mdelay instead.

This fixes following build error.
ERROR: "__bad_udelay" [drivers/staging/bcm/bcm_wimax.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2

Cc: Kevin McKinney <klmckinney1@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>