fs: yaffs: Update for new procfs API
fs: yaffs: Update for new procfs API

The procfs API has changed in 3.10. Port this code to use
seq_printf() and friends so that we can keep it around on 3.10
kernels.

Signed-off-by: Stephen Boyd <010521127f513270fe503d86ab8316ac5147f4b7@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas